noun
a musical group consisting of four string players, typically two violinists, a violist, and a cellist, or a piece of music composed for such a group
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The string quartet performed a beautiful piece by Beethoven at the concert hall.
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I heard that the string quartet is playing at the wedding next week.
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The string quartet totally rocked out at the party last night.
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The team worked together like a well-tuned string quartet, harmonizing perfectly in their tasks.