Since there's a Favorite Song thread, why not a Favorite Album one?? :D
Mine is Quadrophenia by The Who:
I could listen to it all day on repeat! It was the second opera rock of the band and I find both the lyrics and the instrumentation amazing, specially with all the orchestration together with Pete Townshend's guitar.
And what's your favorite album? Try telling us a little bit of it, if you want to!