Scientific pitch notation in the context of Countertenor

A soprano (Italian pronunciation: [soˈpraːno]) is a type of classical singing voice and has the highest vocal range of all voice types. The soprano's vocal range (using scientific pitch notation) is from approximately middle C (C₄) = 261 Hz to A₅ in choral music, or to soprano C (C₆) or higher in operatic music. In four-part chorale style harmony, the soprano takes the highest part, which often encompasses the melody. The soprano voice type is generally divided into the coloratura, soubrette, lyric, spinto, and dramatic soprano.

In music, a pitch class (p.c. or pc) is a set of all pitches that are a whole number of octaves apart; for example, the pitch class C consists of the Cs in all octaves. "The pitch class C stands for all possible Cs, in whatever octave position." Important to musical set theory, a pitch class is "all pitches related to each other by octave, enharmonic equivalence, or both." Thus, using scientific pitch notation, the pitch class "C" is the set

Although there is no formal upper or lower limit to this sequence, only a few of these pitches are audible to humans. Pitch class is important because human pitch-perception is periodic: pitches belonging to the same pitch class are perceived as having a similar quality or color, a property called "octave equivalence".

A clef (from French: clef 'key') is a musical symbol used to indicate which notes are represented by the lines and spaces on a musical staff. Placing a clef on a staff assigns a particular pitch to one of the five lines or four spaces, which defines the pitches on the remaining lines and spaces.

The three clef symbols used in modern music notation are the G-clef, F-clef, and C-clef. Placing these clefs on a line fixes a reference note to that line—an F-clef fixes the F below middle C, a C-clef fixes middle C, and a G-clef fixes the G above middle C. In modern music notation, the G-clef is most frequently seen as treble clef (placing G₄ on the second line of the staff), and the F-clef as bass clef (placing F₃ on the fourth line). The C-clef is mostly encountered as alto clef (placing middle C on the third line) or tenor clef (middle C on the fourth line). A clef may be placed on a space instead of a line, but this is rare.

The violoncello (/ˌvaɪələnˈtʃɛloʊ/ VY-ə-lən-CHEL-oh, Italian pronunciation: [vjolonˈtʃɛllo]), commonly abbreviated as cello (/ˈtʃɛloʊ/ CHEL-oh), is a medium-low pitched bowed (sometimes plucked and occasionally hit) string instrument of the violin family. Its four strings are usually tuned in perfect fifths: from low to high, C₂, G₂, D₃ and A₃. The viola's four strings are each an octave higher. Music for the cello is generally written in the bass clef; the tenor clef and treble clef are used for higher-range passages.

Played by a cellist or violoncellist, it enjoys a large solo repertoire with and without accompaniment, as well as numerous concerti. As a solo instrument, the cello uses its whole range, from bass to soprano, and in chamber music, such as string quartets and the orchestra's string section, it often plays the bass part, where it may be reinforced an octave lower by the double basses. Figured bass music of the Baroque era typically assumes a cello, viola da gamba or bassoon as part of the basso continuo group alongside chordal instruments such as organ, harpsichord, lute, or theorbo. Cellos are found in many other ensembles, from modern Chinese orchestras to cello rock bands.

The viola (/viˈoʊlə/ vee-OH-lə, () Italian: [ˈvjɔːla, viˈɔːla]) is a string instrument of the violin family, and is usually bowed when played. Violas are slightly larger than violins, and have a lower sound. Since the 18th century, it has been the middle or alto voice of the violin family, between the violin (which is tuned a perfect fifth higher) and the cello (which is tuned an octave lower). The strings from low to high are typically tuned to C₃, G₃, D₄, and A₄.

In the past, the viola varied in size and style, as did its names. The word viola originates from the Italian language. The Italians often used the term viola da braccio, meaning, literally, 'of the arm'. "Brazzo" was another Italian word for the viola, which the Germans adopted as Bratsche. The French had their own names: cinquiesme was a small viola, haute contre was a large viola, and taile was a tenor. Today, the French use the term alto, a reference to its range.

A bass is a type of classical male singing voice and has the lowest vocal range of all voice types. According to The New Grove Dictionary of Opera, a bass is typically classified as having a vocal range extending from around the second E below middle C to the E above middle C (i.e., E₂–E₄). Its tessitura, or comfortable range, is normally defined by the outermost lines of the bass clef. Categories of bass voices vary according to national style and classification system.

Italians favour subdividing basses into the basso cantante (singing bass), basso buffo (comical bass), or the dramatic basso profondo (deep bass). The American system identifies the bass-baritone, comic bass, lyric bass, and dramatic bass.

A baritone is a type of classical male singing voice whose vocal range lies between the bass and the tenor voice-types. It is the most common male voice. The term originates from the Greek βαρύτονος (barýtonos), meaning "low sounding". Composers typically write music for this voice in the range from the second F below middle C to the F above middle C (i.e. F₂–F₄) in choral music, and from the second G below middle C to the G above middle C (G₂ to G₄) in operatic music, but the range can extend at either end. Subtypes of baritone include the baryton-Martin baritone (light baritone), lyric baritone, Kavalierbariton, Verdi baritone, dramatic baritone, baryton-noble baritone, and the bass-baritone.

A jingle bell or sleigh bell is a type of bell which produces a distinctive 'jingle' sound, especially in large numbers. They find use in many areas as a percussion instrument, including the classic sleigh bell sound and morris dancing. They are typically used as a cheaper alternative to small 'classic' bells.

The simplest jingle bells are produced from a single piece of sheet metal bent into a roughly spherical shape to contain a small ball bearing or short piece of metal rod. This method of production results in the classic two- or four-leaved shape. Two halves may also be crimped together, resulting in a ridge around the middle. A glass marble may also be used as the ringer on larger bells.

The vuvuzela /vuːvuːˈzɛlə/ is a horn with an inexpensive injection-moulded plastic shell about 65 centimetres (2 ft) long, which produces a loud monotone note typically around B♭ 3 (the first B♭ below middle C). Some models are made in two parts to facilitate storage, and this design also allows pitch variation. Many types of vuvuzela, made by several manufacturers, may produce various intensity and frequency outputs. The intensity of these outputs depends on the blowing technique and pressure exerted. The indoor noise level caused the U.S. NCAA to permanently ban them after the 7 February 1987 Division I Men's Ice Hockey game between the Brown Bears and the Rensselaer Polytechnic Institute Engineers. The noise was so extreme that Brown formally complained and "The RPI Rule" was universally adopted.

The vuvuzela is commonly used at football matches in South Africa, and it has become a symbol of South African football as the stadiums are filled with its sound. The intensity of the sound caught the attention of the global football community during the 2009 FIFA Confederations Cup in anticipation of South Africa hosting the 2010 FIFA World Cup.

The bass oboe or baritone oboe is a double reed instrument in the woodwind family. It is essentially twice the size of a regular (soprano) oboe so it sounds an octave lower; it has a deep, full tone somewhat akin to that of its higher-pitched cousin, the English horn. The bass oboe is notated in the treble clef, sounding one octave lower than written. Its lowest sounding note is B₂ (in scientific pitch notation), one octave and a semitone below middle C, although an extension with an additional key may be inserted between the lower joint and bell of the instrument in order to produce a low B♭₂. The instrument's bocal or crook first curves away from and then toward the player (unlike the bocal/crook of the English horn and oboe d'amore), looking rather like a flattened metal question mark; another crook design resembles the shape of a bass clarinet neckpiece. The bass oboe uses its own double reed, similar to but larger than that of the English horn.

The recorder is a family of woodwind musical instruments and a member of the family of duct flutes that includes tin whistles and flageolets. It is the most prominent duct flute in the western classical tradition. A recorder can be distinguished from other duct flutes by the presence of a thumb-hole for the upper hand and holes for seven fingers: three for the upper hand and four for the lower.

Recorders are made in various sizes and ranges. The sizes most commonly in use today are the soprano (also known as descant, lowest note C₅), alto (also known as treble, lowest note F₄), tenor (lowest note C₄), and bass (lowest note F₃). Recorders were traditionally constructed from wood or ivory. Modern professional instruments are wooden, often boxwood; student and scholastic recorders are commonly made of moulded plastic. The recorders' internal and external proportions vary, but the bore is generally reverse conical (i.e. tapering towards the foot) to cylindrical, and all recorder fingering systems make extensive use of forked fingerings.

A lyric soprano is a type of operatic soprano voice that has a warm quality with a bright, full timbre that can be heard over an orchestra. The lyric soprano voice generally has a higher tessitura than a soubrette and usually plays ingenues and other sympathetic characters in opera. Lyric sopranos have a range from approximately middle C (C₄) to "high D" (D₆). This is the most common female singing voice. There is a tendency to divide lyric sopranos into two groups: light and full.

A dramatic soprano is a type of operatic soprano with a powerful, rich, emotive voice that can sing over, or cut through, a full orchestra. Thicker vocal folds in dramatic voices usually (but not always) mean less agility than lighter voices but a sustained, fuller sound. Usually this voice has a lower tessitura than other sopranos, and a darker timbre. They are often used for heroic, often long-suffering, tragic women of opera. Dramatic sopranos have a range from approximately low A (A₃) to "high C" (C₆). Some dramatic sopranos, known as Wagnerian sopranos or High dramatic sopranos (high in this case referring to the maturity of the voice, rather than the tessitura or range), have an exceptionally big voice that can assert itself over a large orchestra (of more than 80 or even 100 players). These voices are substantial, often denser in tone, extremely powerful and, ideally, evenly balanced throughout the vocal registers. Wagnerian sopranos usually play mythic heroines. Successful Wagnerian sopranos are rare and often Wagnerian roles are performed by Italianate dramatic sopranos.

A440 (also known as Stuttgart pitch) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A₄ in scientific pitch notation. It is standardized by the International Organization for Standardization as ISO 16. While other frequencies have been (and occasionally still are) used to tune the first A above middle C, A440 is now commonly used as a reference frequency to calibrate acoustic equipment and to tune pianos, violins, and other musical instruments.