Though they were best known as the Disco superstars behind the Saturday Night Fever Soundtrack, the Bee Gees were Pop superstars who constantly reinvented themselves running the Pop gamut of Psychedelic, Folk and Blue Eyed Soul.  Through out it all, the brothers Gibb were always showcasing rich harmonies that showcased their exceptional singing ability.  Their pre Saturday Night Fever career alone would make a case for the Rock and Roll Hall.