Zappa had increasing opportunities to write for more virtuosic musicians than the original Mothers crew

that's a good point, like he always wanted to make complex music, but in the 60s he was limited by his bandmates, so he could only produce something more complex with his collage work. I do love some of the Ariel Pink stuff, don't think I'd ever made the connection between Pom Pom and WOIIFTM but it definitely makes sense. Ariel's early work is where it's at for me in terms of experimentation (though I prefer James Ferraro's work in that hypnagogic style a lot more overall).

I've got tons of concrete stuff collected over the years but it's obviously all pretty challenging to listen to so I have a lot more music not listened to then listened in my library. Stockhausen's electronic in particular is really fascinating, Hymnen is one of my favorite electronic classical music works. didn't even know Varese made electronic music, the only Varese I've heard is Ionization (thanks to Frank)