The Beatles' Apple Records signed one of its first artists in 1968 after supermodel Twiggy discovered Mary Hopkin on TV.

You can almost hear the changes coming in these songs. 40. The Righteous Brothers, "Unchained Melody" (From Just Once in My Life) 39. The Byrds, "Turn! Turn! Turn! (To Everything There Is a Season ...

READ MORE: Top 10 Byrds Songs Singer-songwriter Gram Parsons and ... “So You Want to Be a Rock ‘n’ Roll Star” and “Turn! Turn ...