quartet
US /kwɔːrˈtet/
UK /kwɔːrˈtet/
1.
a group of four singers or musicians who perform together
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The string quartet performed a beautiful classical piece.
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She joined a jazz quartet as their lead vocalist.
2.
a musical composition for four instruments or voices
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Mozart's String Quartet No. 19 is a masterpiece.
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The composer wrote a new quartet for the ensemble.
3.
a set of four related things or people
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The book is part of a quartet of novels.
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The research focused on a quartet of key factors.