Composer Christopher Tarnow has been collaborating with Carolina Eyck since 2013. In 2014, the duo released Improvisations for Theremin and Piano
In anticipation of the release, Mr. Tarnow has made his sonatas available for purchase. You can find a list of works and purchasing details at http://christophertarnow.com/Werke
Here's a video of one of the works, Sonata For Theremin and Piano:
