Triangle (musical instrument) in the context of "Conditional learning"

Classical conditioning (also respondent conditioning and Pavlovian conditioning) is a behavioral procedure in which a biologically potent stimulus (e.g. food, a puff of air on the eye, a potential rival) is paired with a neutral stimulus (e.g. the sound of a musical triangle). The term classical conditioning refers to the process of an automatic, conditioned response that is paired with a specific stimulus. It is essentially equivalent to a signal.

Ivan Pavlov, the Russian physiologist, studied classical conditioning with detailed experiments with dogs, and published the experimental results in 1897. In the study of digestion, Pavlov observed that the experimental dogs salivated when fed red meat. Pavlovian conditioning is distinct from operant conditioning (instrumental conditioning), through which the strength of a voluntary behavior is modified, either by reinforcement or by punishment. However, classical conditioning can affect operant conditioning; classically conditioned stimuli can reinforce operant responses.

An orchestra (/ˈɔːrkɪstrə/ ; OR-ki-strə) is a large instrumental ensemble typical of classical music, which combines instruments from different families. There are typically four main sections of instruments:

• The string section, including the violin, viola, cello, and double bass
• The woodwind section, including the flute, oboe, clarinet, bassoon, and occasionally saxophone
• The brass section, including the French horn (commonly known as the "horn"), trumpet, trombone, cornet, and tuba, and sometimes euphonium
• The percussion section, including the timpani, snare drum, bass drum, cymbals, triangle, tambourine, tam-tam and mallet percussion instruments

Other instruments such as the piano, harpsichord, pipe organ, and celesta may sometimes appear in a fifth keyboard section or may stand alone as soloist instruments, as may the concert harp and, for performances of some modern compositions, electronic instruments, and guitars.

A percussion instrument is a musical instrument that is sounded by being struck or scraped by a beater including attached or enclosed beaters or rattles struck, scraped or rubbed by hand or struck against another similar instrument. Excluding zoomusicological instruments and the human voice, the percussion family is believed to include the oldest musical instruments. In spite of being a very common term to designate instruments, and to relate them to their players, the percussionists, percussion is not a systematic classificatory category of instruments, as described by the scientific field of organology. It is shown below that percussion instruments may belong to the organological classes of idiophone, membranophone, aerophone and chordophone.

The percussion section of an orchestra most commonly contains instruments such as the timpani, snare drum, bass drum, tambourine, belonging to the membranophones, and cymbals and triangle, which are idiophones. However, the section can also contain aerophones, such as whistles and sirens, or a blown conch shell. Percussive techniques can even be applied to the human body itself, as in body percussion. On the other hand, keyboard instruments, such as the celesta, are not normally part of the percussion section, but keyboard percussion instruments such as the glockenspiel and xylophone (which do not have piano keyboards) are included.

A percussion mallet or beater is an object used to strike or beat a percussion instrument to produce its sound.

The term beater is slightly more general. A mallet is normally held in the hand while a beater may be a foot or mechanically operated, for example in a bass drum pedal. The term drum stick is less general still but still applied to a wide range of beaters. Some mallets, such as a triangle beater, are normally used only with a specific instrument, while others are used on many different instruments. Often, mallets of differing material and hardness are used to create different timbres on the same types of instrument (e.g. using either wooden or yarn mallets on a xylophone).

The three-hole pipe, also commonly known as tabor pipe or galoubet, is a wind instrument designed to be played by one hand, leaving the other hand free to play a tabor drum, bell, psalterium or tambourin à cordes, bones, triangle or other percussive instrument.

The three-hole pipe's origins are not known, but it dates back at least to the 12th century.

An idiophone is any musical instrument that creates sound primarily by the vibration of the instrument itself, without the use of air flow (as with aerophones), strings (chordophones), membranes (membranophones) or electricity (electrophones). It is the first of the four main divisions in the original Hornbostel–Sachs system of musical instrument classification (see List of idiophones by Hornbostel–Sachs number). The early classification of Victor-Charles Mahillon called this group of instruments autophones. The most common are struck idiophones, or concussion idiophones, which are made to vibrate by being struck, either directly with a stick or hand (like the wood block, singing bowl, steel tongue drum, handpan, triangle or marimba) or indirectly, with scraping or shaking motions (like maracas or flexatone). Various types of bells fall into both categories. A common plucked idiophone is the Jew's harp.

According to Sachs, idiophones

Martial music or military music is a specific genre of music intended for use in military settings performed by professional soldiers called field musicians. Much of the military music has been composed to announce military events as with bugle calls and fanfares, or accompany marching formations with drum cadences, or mark special occasions as by military bands. However, music has been employed in battle for centuries, sometimes to intimidate the enemy and other times to encourage combatants, or to assist in organization and timing of actions in warfare. Depending on the culture, a variety of percussion and musical instruments have been used, such as drums, fifes, bugles, trumpets or other horns, bagpipes, triangles, cymbals, as well as larger military bands or full orchestras. Although some martial music has been composed in written form, other music has been developed or taught by ear, such as bugle calls or drum cadences, relying on group memory to coordinate the sounds.