Recording techs SHOULD have very eclectic taste. If you didn't, you wouldn't be able to accommodate your customers. I keep seeing people say they like "jazz", but there are so many variations. Cali Jazz, Cool Jazz, Dixieland, Honkytonk Piano (all forms, all cool to listen to). But there are some really off the wall jazz projects out there, too.
As far as music style, I still listen to classics occasionally, because there were some great minds out there making some great music. But as with any art form, music is evolving. Almost all music style we have is a fusion of older styles. What we, as engineers, need to focus on is seeing the next metamorphosis of the art form! Some interesting fusions I've heard (bear in mind I only listen to Christian music) Rich Mullins incorporating hammered dulcimer in straight up rock (followed by Third Day and others). Kutless, Needtobreathe (and others) fusing bluegrass instruments into their brands of hard rock, southern rock. Some of my favorite fusions include non-instruments, like (not a Christian band) Dixie Dreggs incorporation of a toy piano in their rock/jazz fusion work. Even country and rock are fusing (have been since the 70s, witness the Eagles/The Band/etc.) One of my favorite eclectic songs is My Last Amen by Downhere. Combines rock and salsa and classical and just a lot of fun stuff (the lead vocalist is the guy that Queen is using on their new tour).
Anyway, love this topic, but I'm out of time.
BroKen