Here’s a couple of alternate recordings of Unchained Melody
The Fleetwoods - Unchained Melody (A Cappella Version)
https://www.youtube.com/watch?v=_FMVR-C_oKw
VITO & THE SALUTATIONS - “UNCHAINED MELODY” (1963)
https://www.youtube.com/watch?v=dHwDeGDkEFk
The Fleetwoods' opus came out on an LP at the end of 1959. It's certainly different from Vito and the gang's uptempo East Coast doo-wop version.