"In a Wiggly Mood" is a fun and exciting piece written in a modified G major position, with C-sharps and A-sharps strewn in throughout. These accidentals are what make this piece so "wiggly". The student must weave in and out of the black keys at a quick tempo. It thus makes this piece and excellent one with which to teach the concept of moving in and out of the keys.
Biographical Information (Composer's website)