Did Pitbull & Kesha Steal 'Timber'? -- Harmonica Player: They Ripped My Riff 'Timber' Harmonica Player Claims 'Timber' Ripped My Riff 6/26/2014 12:20 AM PT

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Pitbull and Kesha may have unknowingly dabbled in stolen goods when they recorded "Timber" ... so says a songwriter who claims the song is a rip-off of one of his tunes.

Lee Oskar -- a self-proclaimed world-famous harmonicist -- says his 1978 song "San Francisco Bay" features a catchy harmonica riff ... the same riff you hear in "Timber" -- but in a faster tempo.

Oskar says it's no coincidence either. He claims in court docs the harmonica player on "Timber" was instructed to mimic Oskar's performance on "SF Bay."

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