Here is a soundtrack played by Cherry Five, a band that would soon change its name for Goblin and begin a brilliant career in composing and playing soundtracks. On this record they play under the name 'Il Reale Impro Britannico' and they didn't actually compose the OST (composed by Willy Brezza). Track A4 (...titled 'Edda' !) features vocals by Edda Dell'Orso.
The movie has been reissued recently on DVD by Mondo Macabro, but there aren't any downloads available on the net yet (not even a trailer)... If you're luckier than me and you fall upon a link to the movie or a trailer, share in the comments !