Hi, Helen - "Lover's Concerto is Bach's Minuet in G (click). Pretty, eh?

I don't think "Unchained Melody" came from a classical piece, but I may be wrong about that. It was written by Hy Zaret (words) and Alex North (music) for the 1955 movie Unchained. It was revived by the Righteous Brothers in 1965.
-Joe Offer-