Surprised to find nothing here re. this great musician/singer/songwriter.
Ry Cooder 1973 New York [live, oct. '73] is worth looking for.
It's a recording of indeterminate origin - kind of a bootleg recording of unknown authorship.
Looks to me like this UK Psychedlia Discussion Forum is about heads in the UK discussing psychedelic music ... but if you drop a tab and listen to Boomer's story, you might learn something, son.
PS.
He was in a band called The Ceyleib People, a psychedelic concept group from Los Angeles, California, USA and also played on Captain Beefheart's Safe as Milk album.