Rhythm section
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A rhythm section is a group of musicians within a music ensemble or band that provides the underlying rhythm, harmony and pulse of the accompaniment, providing a rhythmic and harmonic reference and "beat" for the rest of the band.
The rhythm section is often contrasted with the roles of other musicians in the band, such as the lead guitarist or lead vocals whose primary job is to carry the melody.
Jazz often features a prominent rhythm section, typically consisting of at least drums and bass, and sometimes a comping instrument such as piano or guitar.
This Polish group's rhythm section consists of a Hammond organist, an electric bassist, and a drummer.
Dixieland band rhythm sections sometimes use a tuba for the bassline.
Bassline
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Bassline 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 by a rhythm section instrument such as the electric bass, double bass, cello, tuba or keyboard.
Victor Wooten soloing on the electric bass guitar
A German double bass section in 1952. The player to the left is using a German bow.
TB-303 front panel