Q: What do the GLASS FROG and the GLASS ARMONICA have in common? A: They're both in this video from Songs for Unusual Creatures in association with PBS Digital Studios! The glass frog is called so because it has see-through skin on its stomach! How crazy is that? You can see just about all of its inner organs, including its beating heart. The glass armonica, on the other hand, is one of the rarest and most exotic musical instruments and it was invented by Benjamin Franklin! Join Michael on a visit to the "Frog Pod" at the Atlanta Botanical Garden and then check out Michael Hearst's friend Cecilia Brauer play a tune for the glass frog on a glass armonica.