Tonguewizard And The Journey For The Perfect Instrument

The theramind, who is actually a disembodied ear, and speaks through expert manipulation of a theramin of legend, rides atop a musically controlled hovercraft.

Also the obstacle involves those little chattering wind up teeth that could deliver a nasty bite to tounge wizard, though TW could feasibly nestle inside of one and be able to speak clearly...
...but that may all be part of the theramind's plan.