Happy to help!
Truth be told I used to only like hard rock myself...it was surround that helped me discover great stuff like jazz fusion and prog I otherwise never would've bothered with.
Unfortunately when it comes to rock, there is a real treasure trove of high profile quads that haven't made it out yet. Stuff like Aerosmith, Edgar and Johnny Winter, Rick Derringer, Eagles, Doobie Brothers, etc.
Of the commercially released quad discs, my highest recommendations for hard rock lover would be:
- Deep Puple- Machine Head
- BoC- Secret Treaties
- Jeff Beck Group- Orange Album, Rough and Ready
- Beck Bogert & Appice
- Ten Years After- A Space In Time (requires some user correction- fronts and rears are swapped)
I'll probably think of more later. Most surround releases today are prog albums- likely due to the efforts of Steven Wilson- so rock hasn't really gotten the attention it deserves yet.