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In page Quartet:

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The quartet lineup is also very common in pop and rock music. A standard quartet formation in pop and rock music is an ensemble typically consisting of a vocalist, an electric guitar, a bass guitar, and a drum kit. This configuration is sometimes modified so that the vocalist also plays guitar, or sometimes a keyboard instrument (e.g., organ, piano, synthesizer) or soloing instrument (e.g., saxophone) may be used.[citation needed]