Artists with quad recordings announced in 1975 , No longer with Rhino :
Jimi Hendrix-Crash Landing
The Beach Boys - Good Vibrations
Frank Zappa -One Size Fits All
Van Morrison- Hard Nose The Highway (more recently discovered)
Allman Brothers-Brothers And Sisters
Also announced but not in the vault :
Foghat -Rock And Roll Outlaws
Rolling Stones -Bill Wyman , released but no longer with Rhino.
Emerson, Lake, and Palmer -Welcome Back.....released in Q8 , but no longer with Rhino.
I believe the hold up with Rod Stewart, is obtaining his say so for release.
Also , let's not forget the FIVE quads from Europe ;
Fats Domino -Montreaux Hello Josephine
Ralph McTell- Right Side Up
Absolute Elsewhere-In Search Of Ancient Gods*
Deaf School -Second Honeymoon*
Passport -Handmade*
--The bottom 3* are incredible Quadraphonic Mixes and Musically superb .
The Passport and ZZ TOP , seem to be elusive with vault searching , at least according to Steve Woolard
@ForagingRhino
A newer Rhino acquisition I wouldn't mind seeing on Quadio is the Far Out Production of.... 'Eric Burdon -Sun Secrets'.