You'll need to buy the Paramount DVD that came out in the U.S. last year. As far as I know that's the only way of hearing any of the songs sung by Donovan, or the score by Ken Thorne.
I've been after this since film was released Jan.
If you buy the DVD you can record your favourite passages, you will have some dialogue and sound effects, yet as of today is the only way you'll hear them.
Don't get the Ortolani disc as Donovan is not there.
Beautiful spiritual songs.