You don't need instruments to lay down the funk.
Recording artist L. Young performs all the parts in his one-man, a cappella version of "Uptown Funk," originally recorded by Mark Ronson and Bruno Mars.
L. Young (and his musical alter egos, Da Youngstaz) have a slew of one-man songs on YouTube, covering several popular artists from Stevie Wonder to Lionel Richie.
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