Can - Tago Mago
Alright so my rec to you for expiremental rock comes from seminal psych rock/krautrock band Can and there 2nd full length Tago Mago. You get you're nice shorter more rock orientated tracks like Mushroom (grooviest track ever!) and Paperhouse, as well as jams like Oh Yeah and Hallelluwah. My personal favorite is the synth nightmare-scape that is Aumgn it scared the hell out me the first time I heard it.
Definately check this out if you haven't already.