A song by David Crosby (main culprit, and congrats to the newly-revealed proud papa of the Etheridge/Cypher young'uns - same ol' Dave :) and Jim McGuinn, from The Byrds' Fifth Dimension LP, 1966. Just your garden-variety Byrdsong, from their "space(y)-rock" phase. It was covered by Yes on their debut album (1969), due to sheer lack of original material. Byrdfans must have been displeased at the time; trust only Genuine Original Byrd Brothers Space-Rock®! Your ears will thank you, once they grow mouths to speak, man.