What do The Byrds' The Ballad of Easy Rider, Linda Ronstadt and the Stone Poneys' Evergreen Vol. 2, and Helen Reddy's Music, Music all have in common? Every one of those albums features a song by Pamela Polland. Also known as one-half of the sixties folk-pop duo The Gentle Soul and a member of Joe Cocker's Mad Dogs and Englishmen ensemble, Polland's songs have additionally been recorded by artists as diverse as Vikki Carr, Nancy Ames, Bobby Bare, The Pointer Sisters, and Anita Carter. But