Tenor in the context of "Viola"

A barbershop quartet is a group of four singers who sing music in the barbershop style, characterized by four-part harmony without instrumental accompaniment (a cappella). The four voices are: the lead, the vocal part which typically carries the melody; a bass, the part which provides the bass line to the melody; a tenor, the part which harmonizes above the lead; and a baritone, the part that frequently completes the chord. The baritone normally sings just below the lead singer, sometimes just above as the harmony requires. Barbershop music is typified by close harmony—the upper three voices generally remain within one octave of each other.

While the traditional barbershop quartet included only male singers, contemporary quartets can include any gender combination. All-female barbershop quartets were often called beauty shop quartets, a term that has fallen out of favor. The voice parts for women's and mixed barbershop groups use the same names as those for male groups since the roles perform similar functions in the quartet although the vocal ranges may be different.

In music theory, the term mode or modus is used in a number of distinct senses, depending on context.

Its most common use may be described as a type of musical scale coupled with a set of characteristic melodic and harmonic behaviors. It is applied to major and minor keys as well as the seven diatonic modes (including the former as Ionian and Aeolian) which are defined by their starting note or tonic. (Olivier Messiaen's modes of limited transposition are strictly a scale type.) Related to the diatonic modes are the eight church modes or Gregorian modes, in which authentic and plagal forms of scales are distinguished by ambitus and tenor or reciting tone. Although both diatonic and Gregorian modes borrow terminology from ancient Greece, the Greek tonoi do not otherwise resemble their medieval/modern counterparts.

The euphonium (English: /juˈfoʊniːəm/ yoo-FOH-nee-əm; Italian: eufonio; Spanish: bombardino) is a tenor- and baritone-voiced valved brass instrument pitched in 9-foot (9′) B♭ an octave below the B♭ trumpet or cornet, employed chiefly in brass, military, and concert bands. The euphonium is a member of the large family of valved bugles, along with the tuba and flugelhorn, characterised by a wide conical bore. Most instruments have four valves, usually compensating piston valves, although instruments with four or five rotary valves are common in Eastern and Central Europe.

Euphonium repertoire can be notated in concert pitch in the bass clef, or in the treble clef as a transposing instrument in B♭. In British brass bands, it is typically treated as a treble-clef instrument, while in American band music, parts may be written in either treble clef or bass clef, or both. A musician who plays the euphonium is known as a euphoniumist, a euphonist, or simply a euphonium player.

Barbershop vocal harmony is a style of a cappella close harmony, or unaccompanied vocal music, characterized by consonant four-part chords for every melody note in a primarily homorhythmic texture. Each of the four parts has its own role: generally, the lead sings the melody, the tenor harmonizes above the melody, the bass sings the lowest harmonizing notes, and the baritone completes the chord, usually below the lead. The melody is not usually sung by the tenor or baritone, except for an infrequent note or two to avoid awkward voice leading, in tags or codas, or when some appropriate embellishment can be created. One characteristic feature of barbershop harmony is the use of what is known as "snakes" and "swipes". This is when a chord is altered by a change in one or more non-melodic voices. Occasional passages may be sung by fewer than four voice parts.

Barbershop music is generally performed by either a barbershop quartet, a group of four typically male singers with one on each vocal part, or a barbershop chorus, which closely resembles a choir with the notable exception of the genre of music.

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.

Earth, Wind & Fire (abbreviated as EW&F or EWF) is an American band formed in Chicago, Illinois, in 1969. Their music spans multiple genres, including jazz, R&B, soul, funk, disco, pop, Latin and Afro-pop. They are among the best-selling bands of all time, with sales of over 90 million records worldwide.

The band was formed by Maurice White, originating out of the Salty Peppers; its history includes a hiatus from mid-1984 to mid-1987. Prominent members have included Verdine White, Philip Bailey, Ralph Johnson, Larry Dunn, Al McKay, Roland Bautista, Robert Brookins, Sonny Emory, Ronnie Laws, Sheldon Reynolds and Andrew Woolfolk. The band is known for its kalimba sound, dynamic horn section, energetic and elaborate stage shows, and the contrast between Bailey's falsetto and Maurice's tenor vocals.

Peter, Paul and Mary was an American folk group formed in New York City in 1961 during the American folk music revival. The trio consisted of Peter Yarrow (guitar, tenor vocals), Paul Stookey (guitar, baritone vocals), and Mary Travers (contralto vocals). The group's repertoire included songs written by Yarrow, Luis Manuel and Stookey, early songs by Bob Dylan, and covers of other folk musicians.

They were very successful in the early- and mid-1960s, with their debut album topping the charts for weeks, and helped popularize the folk music revival. Following Travers's death in 2009, Yarrow and Stookey continued to perform as a duo. Yarrow died in 2025, leaving Stookey the sole surviving member of the group.