Beckett-Buckley.

"On Buckley's self-titled 1966 debut, and on his 1967 follow-up Goodbye and Hello, [Larry] Beckett cowrote about half the tunes (the others were penned solely by Buckley). In general, the Beckett-Buckley compositions were distinguished from those Buckley wrote alone by the literary, metaphysical tone of Beckett's lyrics, which had little counterpart in rock or folk-rock in 1966 and 1967. In the hands of a less gifted melody writer and vocalist than Buckley, they may have been too ambitious to get pulled off, but they fit Buckley's own searching, yearning persona well."
http://www.answers.com/topic/larry-beckett

"He was the opposite of me, so it was very strange that we became such good friends - we became best friends immediately upon meeting one another. I was very intellectual and disciplined and he was very loose and passionate. I think actually that was part of the secret, that obscurely we sensed we each had what the other person needed - the whole human being, the whole artist. If he would try to write a song it would just drift aimlessly. But if I had these overly-rigorous lyrics in place, then it would give a structure for him to work with. He would infuse my too-tight songwriting with his passion, and loosen it up. It was a kind of magical formula. And it worked in life and it worked in art. We sensed that, I don't think we really understood it at the time, though."
[Larry Beckett, over Tim Buckley.]