The whole album was supposed to be a play on a pirate radio station if memory serves, and a damn good one at that. Probably my favorite Who album honestly (besides Live at Leeds, of course).
Uhhhh I'd have to take Quadraphenia in any best Who album list...I think I've bought it at least 6 times in like 4 formats and I can still listen to it end-to-end without effort.
Edit: and yes the album is available on Spotify in full.