Oh, get your mind out of the gutter; we're talking about The Who.
Specifically -- and as part of what seems to be turning into a continuing series of Previously Unheard Stereo Mixes of the Gods -- an absolutely astonishing remixed and remastered version of "So Sad About Us," one of the band's earliest power pop masterpieces. From the 2008 Japanese deluxe edition of the 1966 album referenced above.
Words fail me. No kidding -- I've never heard any version of this before, on vinyl or CD, that sounded remotely as glorious.