Tune of the day - Tim Buckley

Came across this recently when looking for guitar tabs. This is a rare clip of Tim Buckley, appearing on the last ever episode of 'The Monkees' TV show (in the 60's).

He is probably more known these days for having been the father of Jeff Buckley, but I remember hearing this memorable tune (Song to the Siren) way back in my schooldays in the 80's, performed by This Mortal Coil (a splinter act from the Cocteau Twins?).