One trick is to only choose instruments that are pleasant sounding, no matter how they are played. STL Ocarinas fit this description with beautiful, ancient sound.
We were sent two ocarinas to try:
Teacarina: When I first opened up our Teacarina, I thought, what a charming little cup. This multifunctional instrument allows you to play and sip, which is sure to delight any child.
The Teacarina, a combination pottery teacup and ocarina, allows you to play simple tunes between sips of your favorite tea or other hot drink.
Manufactured in a range of beautiful colors, the Teacarina is a hollow walled, handle-less teacup that doubles as a soothing and intriguing musical instrument.
As with other ocarina, you produce music by blowing through an air chamber, changing pitch by fingering four holes of various sizes on the side on the cup.