cynlee, I didn't even try to do something for the "rocks" Simon... because this house is full of too many special ones... enough for a book, not just a thread, so a single image? Right. Anyway, I like your uncle. ;) One of my aquaintances plays the recorders with her nose. It is somewhat disturbing to watch, but she gets a tune out of them. We can do almost anything if we practice hard enough! Thanks for the links, too. I wonder how we humans discovered that blowing through a tube would yield a sound, but we might have started with horns and shells (found objects) before shaping instruments. There is a stone age bone flute, so the knowledge of how to coax out more than one sound is very, very old. Carolly