This is something that isn't getting enough love from modern composers, and is often just pushed aside as a curiosity or whatever.
What I'm recommending is all the works Hindemith wrote for Trautonium and of course Oskar Sala. The majority of the work was written in the early 1930s, and were written in trio (trantonium trios.)
What's also important is the historical relevance of this work, being one of the first attempts at using electricity to produce music.
For more info on this instrument:
Trautonium - Wikipedia, the free encyclopedia
For an example of these pieces, there's an OLD recording from Oskar Sala himself and Hindemith which is freely available since it's part of a project dedicated to preserving these type of old-avant garde things. ...And of course these people are all dead.
Here's the piece:
http://www.avantgardeproject.org/AGP...rautonium.flac
and here is some info on that:
http://www.avantgardeproject.org/AGP...in%20notes.txt
So there you go. For an added note, Oskar Sala did the soundtrack to Birds from Hitchcock~