When Ike & Tina Turner recorded "River Deep, Mountain High" in 1966, it was commercially unsuccessful in the United States, but became a huge hit in the UK. It has since become one of Tina Turner's signature songs--a concert staple, having been covered by many artists. Celine Dion, Fefe Dobson, The Supremes, Annie Lennox, Neil Diamond and Tom Jones are just a few names that to take a stab at what "Beatle" George Harrison declared "A perfect record from start to finish." "Rolling Stone" magazine put it at #33 on its list of the 500 Greatest Songs of All Time, and Turner is represented in the Grammy Hall of Fame for the song. So who did it best?