He was an early member of Emmylou's "Hot Band"
(She's never forgot the advice she received from her mentor/lover, Gram Parsons, who said, "Buy the best band you can (or can't) afford".....and she always has)
He is also the greatest C&W songwriter of his generation.
He and Emmylou wrote a song that closes her third album, Luxury Liner, called "Tulsa Queen" that is such a lonesome, heartbreaking, train-song, that even Hank Williams would've cried.
(because he didn't write it)
His first album (which I don't think has surfaced on CD) was called Ain't Living Long Like This and the title song is a "Memphis Sound" rockabilly that positively will make you get up and dance.