You might want to check out this page at my site for the "making an ocarina" part:
http://glassattic.com/polymer/kids_beginners.htm
(...click on the category called OTHER IDEAS & MISC. TECHNIQUES a little more than halfway down the list, then scroll down to the MUSICAL INSTRUMENTS section)

And p.s., if you need any more info about using *polymer* clays, check out the rest of my site from the "Table of Contents" page:
http://glassattic.com/polymer/contents.htm

As for songs with pentatonic scales, check these out:
http://www.google.com/search?q=pentatonic+songs

HTH,

Diane B.