Heya! Have a listen at the “Gone Missing” theme song off here:
http://www.gonemissing.us – that’s my Renaissance Festival group, and I just HAD to use my Busman Delrin whistle to do the backup on the theme. What a terrific whistle! 
And if you discover that, once you’re there, you just can’t resist getting one of our CDs, well Cyfiawnder’s new low D is featured on that! (I should probably mention that I also used a couple of my own whistles in the making of the CD, too, and one from John McHaffie!)
Cheers,
Bill Whedon
Serpent Music
Loch Ness Minstrels