If you want to hear some of the most jaw-droppingly amazing schidt ever done on a theremin, you must check out Pamelia Kursten.
She plays theremin...but she's the bass player in the band! It's like watching someone play air bass: her left hand controls pitch, her right hand controls articulation...it looks like she's playing an invisible upright! Weirder still, it sounds like she's playing an upright! She swings, she grooves, she kicks yer azz and shakes yer booty just like a bassist oughtta. I'd go so far as to say her technique, lines, and musicality are quite a bit better than a lot of actual bassists I've heard.
'twill blow yer mind.