Orchestration
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Orchestration is the study or practice of writing music for an orchestra or of adapting music composed for another medium for an orchestra. Also called "instrumentation", orchestration is the assignment of different instruments to play the different parts of a musical work. For example, a work for solo piano could be adapted and orchestrated so that an orchestra could perform the piece, or a concert band piece could be orchestrated for a symphony orchestra.
A hand-written musical score for Act 2 of the opera Der Freischütz by Carl Maria von Weber, written in the 1820s. The score contains all the parts for the singers and the accompaniment parts and melodies for the orchestra.
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.