Neither Michael nor Britney had any formal training on any instrument, but both liked to play the piano.
Michael liked to improvise songs on the piano. He also enjoyed playing to his children. There are many photographs showing Michael fooling around with drums, guitars and other instruments.
Justin Timberlake taught Britney the basics of the instrument and she's been composing parts of some of her songs ever since.

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The King and Princess of Pop: shared traits of two performers
RandomA series of vignettes describing the traits these two gifted performers share.