septet
US /sepˈtet/
UK /sepˈtet/
1.
a group of seven people playing music or singing together
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The jazz septet performed a lively improvisation.
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She composed a new piece for a string septet.
2.
a musical composition for seven instruments or voices
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Mozart's Divertimento in B-flat major is a famous septet.
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The concert featured a rare performance of Schubert's Octet, which is essentially a septet with an added double bass.