If it is Unchained Melody you mean it is one of the true "Golden Oldies" realeased in 1955 by a guy called Al Hibbler, (I think as part of the sound track for a film) its' been covered by loads of people, including Jimmy Young, the Righteous Brothers, Robson & Jerome who all reached No 1 with it. I've often thought it's the sort of song you have to be really rubbish to make a mess of