I found it, but it's from the 80's: I'd choose Two Of Us from Crisis What Crisis instead, it's better and even more mellow.
Obscure, you say? From 1975, behind the iron curtain, Mircea Vintila - "Pamantul, deocamdata" (in loose translation, "Earth, as we know it" ) I just love his voice. And the flow of his songs.
Nick Drake - From the Morning The Bealtes - Within You Without You John and Beverley Martyn - Auntie Aviator Bob Marley and the Wailers - Exodus Black Sabbath - Planet Caravan Jefferson Airplane - Wooden Ships David Crosby - I'd Swear There Was Somebody Here Joni Mitchell - The Hissing of Summer Lawns Marvin Gaye - Inner City Blues The Velvet Underground - Sunday Morning Pink Floyd - Breathe (In the Air) ABBA - Eagle Crosby, Stills & Nash - Long Time Gone The Mamas & the Papas - Step Out Procol Harum - A Whiter Shade of Pale Cat Stevens - Longer Boats Fleetwood Mac - Why