Drum

In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid.In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters (56 ft) to 1.7 centimeters (0.67 in). Sound waves above 20 kHz are known as ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infrasound. Different animal species have varying hearing ranges, allowing some to even hear ultrasounds.

A musical instrument is a device created or adapted to make musical sounds. In principle, any object that produces sound can be considered a musical instrument—it is through purpose that the object becomes a musical instrument. A person who plays a musical instrument is known as an instrumentalist.

The history of musical instruments dates to the beginnings of human culture. Early musical instruments may have been used for rituals, such as a horn to signal success on the hunt, or a drum in a religious ceremony. Cultures eventually developed composition and performance of melodies for entertainment. Musical instruments evolved in step with changing applications and technologies.

A music box (American English) or musical box (British English) is an automatic musical instrument in a box that produces musical notes by using a set of pins placed on a revolving cylinder or disc to pluck the tuned teeth (or lamellae) of a steel comb. The popular device best known today as a "music box" developed from musical snuff boxes of the 18th century and were originally called carillons à musique (French for "chimes of music"). Some of the more complex boxes also contain a tiny drum and/or bells in addition to the metal comb.

Entheogens are psychoactive substances used in spiritual, religious, recreational, therapeutic, and experimental contexts to induce altered states of consciousness. While the term itself emphasizes ritual and sacred applications, the same substances are also frequently employed recreationally—sometimes in ways that diverge from or disregard traditional protocols. Hallucinogens such as the psilocybin found in so-called "magic" mushrooms have been used in sacred contexts since ancient times. Derived from a term meaning "generating the divine from within", entheogens are, in religious and shamanic contexts, intentionally employed in the attempt to facilitate experiences of transcendence, healing, divination, and mystical insight.

Entheogens have been used in religious rituals in the belief they aid personal spiritual development. Anthropological study has established that entheogens are used for religious, magical, shamanic, or spiritual purposes in many parts of the world. Civilizations such as the Maya and Aztecs used psilocybin mushrooms, peyote, and morning glory seeds in ceremonies meant to connect with deities and perform healing. They have traditionally been used to supplement diverse practices, such as transcendence, including healing, divination, meditation, yoga, sensory deprivation, asceticism, prayer, trance, rituals, chanting, imitation of sounds, hymns like peyote songs, drumming, and ecstatic dance.

The timpani (/ˈtɪmpəni/; Italian pronunciation: [ˈtimpani]) or kettledrums (also informally called timps) are musical instruments in the percussion family. A type of drum categorised as a hemispherical drum, they consist of a membrane called a head stretched over a large bowl traditionally made of copper. Thus timpani are an example of kettledrums, also known as vessel drums and semispherical drums, whose body is similar to a section of a sphere whose cut conforms the head. Most modern timpani are pedal timpani and can be tuned quickly and accurately to specific pitches by skilled players through the use of a movable foot-pedal. They are played by striking the head with a specialized beater called a timpani stick or timpani mallet. Timpani evolved from military drums to become a staple of the classical orchestra by the last third of the 18th century. Today, they are used in many types of ensembles, including concert bands, marching bands, orchestras, and even in some rock bands.

Timpani is an Italian plural, the singular of which is timpano, though the singular may also be referred to as a timpanum. In English the term timpano is only widely in use by practitioners: a single drum is often referred to as a timpani, leading many to incorrectly pluralize the word as timpanis. A musician who plays timpani is a timpanist.

Ecstatic dance is a form of dance in which the dancers, sometimes without the need to follow specific steps, release themselves to the rhythm and move freely as the music takes them, leading to trance and a feeling of ecstasy. The effects of ecstatic dance begin with ecstasy itself, which may be experienced in differing degrees. Dancers are described as feeling connected to others, and to their own emotions. The dance serves as a form of meditation, helping people to cope with stress and to attain serenity.

In the ancient and widespread practice of shamanism, ecstatic dance and rhythmic drumming are used to alter consciousness in spiritual practices. Ecstatic sacred dances are known also from religious traditions around the world. Modern ecstatic dance was revived by Gabrielle Roth in the 1970s and formalised in her 5Rhythms practice; it is now found in variants across the western world. Attitudes to ecstatic dance have varied widely. In the 1920s, musicologists such as Paul Nettl and Fritz Böhme considered it primitive and unrefined. More recently, it has been compared to dancing in raves and in club culture, the anthropologist Michael J. Winkelman and the musicologist Rupert Till finding in these forms elements of ritual, spirituality, and healing. The philosopher Gediminas Karoblis relates early ecstatic dance to religious ritual, and notes that all well-executed dance borders on ecstasy.

A drum kit, acoustic drum kit or drum set (also known as a trap set, or simply drums in popular music and jazz contexts) is a musical instrument consisting of a collection of percussion instruments arranged to be played by a single musician. It typically includes drums, cymbals, and sometimes other auxiliary percussion instruments. The drummer usually plays while seated on a drum throne, using drumsticks or special wire or nylon brushes to strike the drums and cymbals, as well as pedals to operate the bass drum and hi-hat, allowing them to adapt the sound to their desired effect.

The drum set is not standardized, but usually consists of:

The bass drum is a large drum that produces a note of low definite or indefinite pitch. The instrument is typically cylindrical, with the drum's diameter usually greater than its depth, with a struck head at both ends of the cylinder. The heads may be made of calfskin or plastic and there is normally a means of adjusting the tension, either by threaded taps or by strings. Bass drums are built in a variety of sizes, but size does not dictate the volume produced by the drum. The pitch and the sound can vary much with different sizes, but the size is also chosen based on convenience and aesthetics. Bass drums are percussion instruments that vary in size and are used in several musical genres. Three major types of bass drums can be distinguished.

• The type usually seen or heard in orchestral, ensemble or concert band music is the orchestral, or concert bass drum (in Italian: gran cassa, gran tamburo). It is the largest drum of the orchestra.
• The kick drum, a term for a bass drum associated with a drum kit, which is much smaller than the above-mentioned bass drum. It is struck with a beater attached to a pedal.
• The pitched bass drum, generally used in marching bands and drum corps, is tuned to a specific pitch and is usually played in a set of three to six drums.

In many forms of music, the bass drum is used to mark or keep time. The bass drum makes a low, boom sound when the mallet hits the drumhead. In marches, it is used to project tempo (marching bands historically march to the beat of the bass). A basic beat for rock and roll has the bass drum played on the first and third beats of bars in common time, with the snare drum on the second and fourth beats, called backbeats. In jazz, the bass drum can vary from almost entirely being a timekeeping medium to being a melodic voice in conjunction with the other parts of the set.

In physics, a transverse wave is a wave that oscillates perpendicularly to the direction of the wave's advance. In contrast, a longitudinal wave travels in the direction of its oscillations. All waves move energy from place to place without transporting the matter in the transmission medium if there is one. Electromagnetic waves are transverse without requiring a medium. The designation “transverse” indicates the direction of the wave is perpendicular to the displacement of the particles of the medium through which it passes, or in the case of EM waves, the oscillation is perpendicular to the direction of the wave.

A simple example is given by the waves that can be created on a horizontal length of string by anchoring one end and moving the other end up and down. Another example is the waves that are created on the membrane of a drum. The waves propagate in directions that are parallel to the membrane plane, but each point in the membrane itself gets displaced up and down, perpendicular to that plane. Light is another example of a transverse wave, where the oscillations are the electric and magnetic fields, which point at right angles to the ideal light rays that describe the direction of propagation.

A frame drum is a drum that has a drumhead width greater than its depth. It is one of the most ancient musical instruments, and perhaps the first drum to be invented. It has a single drumhead that is usually made of rawhide, but man-made materials may also be used. Some frame drums have mechanical tuning, while on many others the drumhead is tacked in place. The drumhead is stretched over a round, wooden frame called a shell. The shell is traditionally constructed of rosewood, oak, ash etc. that has been bent and then scarf jointed together; though some are also made of plywood or man-made materials. Metal rings or jingles may also be attached to the frame. In many cultures, larger frame drums are played mainly by men in spiritual ceremonies, while medium-size drums are played mainly by women.

The talking drum is an hourglass-shaped drum from West Africa, which can be used as a form of speech surrogacy by regulating its pitch and rhythm to mimic the tone and prosody of human speech. It has two drumheads connected by leather tension cords, which allow the player to change the pitch of the drum by scraping the cords between their arm and body.

Originating from the 18th century, talking drum players used tones to disseminate messages, such as news of ceremonies and commands, over 4-5 mile distances.

The conga, also known as tumbadora, is a tall, narrow, single-headed drum from the Congo. Congas are staved like barrels and classified into three types: quinto (lead drum, highest), tres dos or tres golpes (middle), and tumba or salidor (lowest). Congas were originally used in Afro-Cuban music genres such as conga (hence their name) and rumba, in which each drummer would play a single drum. Following numerous innovations in conga drumming and construction during the mid-20th century, as well as its internationalization, it became increasingly common for drummers to play two or three drums. Congas have become a popular instrument in many forms of Latin music such as son (when played by conjuntos), descarga, Afro-Cuban jazz, salsa, songo, merengue and Latin rock.

The origins of the conga drum can be traced back to West and Central Africa, especially regions now known as Congo, Nigeria, and Angola. The modern version of the conga was developed by Cuban people of African descent during the late 19th century or early 20th century. Its direct ancestors are thought to be the yuka and makuta (of Bantu origin) and the bembé drums (of Yoruba origin). In Cuba and Latin America, congas are primarily played as hand drums. In Trinidadian calypso and soca, congas are sometimes struck with mallets, while in the Congos, they are often struck with one hand and one mallet.

Acoustic membranes are flexible membranes used to produce, transmit or regulate sound, ranging from the simple to complex. In musical instruments such as drums, it is the drumhead that is vibrated to produce sound; in microphones and loudspeakers, it is diaphragms and cones that transfer sound waves to and from electricity to play music and facilitate communication. Not merely a device used to produce sound, it is also used to prevent it—barium-free viscoelastic polymers such as Acoustiblok, at merely 1/8-to-1/4-inch thickness, or Tecsound 50 heavy-duty vinyl, block out their way with their energy-converting function turning over to heat to silence walls and floors. Amazing as that is, research continues to break boundaries; ultrathin self-healing membranes composed of polyborodimethylsiloxane effectively absorb low-frequency noise (200–1000 Hz) with over 95% efficiency and restore their acoustic function once injured to open new doors to construction, automotive and aerospace applications. Such versatility—from ancient drums to innovative noise confinement—testament to the manner in which the humble yet pliable acoustic membranes find their niche in developing and diverse uses.

A drumhead or drum skin is a membrane stretched over one or both of the open ends of a drum. The drumhead is struck with sticks, mallets, or hands, so that it vibrates and the sound resonates through the drum.

Additionally outside of percussion instruments, drumheads are also used on some string instruments, most notably the banjo.