I remember seeing Silly Wizard some 16 years back when Andy Stewart did renditions of two or three beautiful examples of Scots mouth music, though alas I didn't catch names of any of them. It would be worth looking into the Silly Wizard/Andy Stewart corpus to see what mouth music the boys may have committed to vinyl, tape or CD. I'd check with the folks at Green Linnet Records as a place to begin.

Good luck.

Also, thanks to cleod for the lead on the "Celtic Odyssey" CD. Sounds like a great one to pick up.