Tuba in the context of "Walking bass"

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.

Bassline (also known as a bass line or bass part) is the term used in many styles of music, such as blues, jazz, funk, dub and electronic, traditional, and classical music, for the low-pitched instrumental part or line played (in jazz and some forms of popular music) by a rhythm section instrument such as the electric bass, double bass, cello, tuba or keyboard (piano, Hammond organ, electric organ, or synthesizer).

In unaccompanied solo performance, basslines may simply be played in the lower register of any instrument while melody and/or further accompaniment is provided in the middle or upper register. In solo music for piano and pipe organ, these instruments have an excellent lower register that can be used to play a deep bassline. On organs, the bass line is typically played using the pedal keyboard and massive 16' and 32' bass pipes.

John Philip Sousa (/ˈsuːzə, ˈsuːsə/ SOO-zə, SOO-sə, Portuguese: [ˈso(w)zɐ]; November 6, 1854 – March 6, 1932) was an American composer and conductor of the late Romantic era known primarily for U.S. military marches. He is known as "The March King" or the "American March King", to distinguish him from his British counterpart Kenneth J. Alford. Among Sousa's best-known marches are "The Stars and Stripes Forever" (National March of the United States of America), "Semper Fidelis" (official march of the United States Marine Corps), "The Liberty Bell", "The Thunderer", and "The Washington Post".

Sousa began his career playing violin and studying music theory and composition under John Esputa and George Felix Benkert. In 1868, Sousa's father enlisted him in the United States Marine Band as an apprentice. Sousa left the band in 1875, and over the next five years, he performed as a violinist and learned to conduct. In 1880, Sousa rejoined the Marine Band and served there for 12 years as director. In 1892, he left the Marine Band and organized the civilian Sousa Band. From 1880 until his death, Sousa focused exclusively on conducting and writing music. He aided in the development of the sousaphone, a large brass instrument similar to the helicon and tuba.

The trombone is a musical instrument in the brass family. As with all brass instruments, sound is produced when the player's lips vibrate inside a mouthpiece, causing the air column inside the instrument to vibrate. Nearly all trombones use a telescoping slide mechanism to alter the pitch instead of the valves used by other brass instruments. The valve trombone is an exception, using three valves similar to those on a trumpet, and the superbone has valves and a slide.

The word trombone derives from Italian tromba (trumpet) and -one (a suffix meaning 'large'), so the name means 'large trumpet'. The trombone has a predominantly cylindrical bore like the trumpet, in contrast to the more conical brass instruments like the cornet, the flugelhorn, the baritone, and the euphonium. The two most frequently encountered variants are the tenor trombone and bass trombone; when the word trombone is mentioned alone; it is mostly taken to mean the tenor model. These are treated as non-transposing instruments, reading at concert pitch in bass clef, with higher notes sometimes being notated in tenor clef. They are pitched in B♭, an octave below the B♭ trumpet and an octave above the B♭ contrabass tuba. The once common E♭ alto trombone became less common as improvements in technique extended the upper range of the tenor, but it is regaining popularity for its lighter sonority. In British brass-band music the tenor trombone is treated as a B♭ transposing instrument, written in treble clef, and the alto trombone is written at concert pitch, usually in alto clef.

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.

A bassist (also known as a bass player or bass guitarist) is a musician who plays a bass instrument such as a double bass (upright bass, contrabass, wood bass), bass guitar (electric bass, acoustic bass), keyboard bass (synth bass) or a low brass instrument such as a tuba or trombone. Many musical genres tend to be associated with at least one or more of these instruments.