Since producing low pitches usually requires a long air column or string, the string and wind bass instruments are usually the largest instruments in their families or instrument classes.|In musical compositions, such as songs and pieces, these are the lowest parts of the harmony.|In choral music without instrumental accompaniment, the bass is supplied by adult male bass singers.|In an orchestra, the basslines are played by the double bass and cellos, bassoon or contrabassoon, low brass such as the tuba and bass trombone, and the timpani (kettledrums).

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