The Beach Boys. Live in Chicago, March of 1965. Carl Wilson on Rickenbacker 12-string; Brian Wilson(!) on lead vocal and bass.
In glorious stereo, as nature intended.
This must have been one of the last shows Brian played with the band before he left the road after his famous nervous breakdown. (I saw them at Asbury Park in June or July of that year, with Glen Campbell filling in).
In any case, the next time somebody tells me these guys were whitebread and a crappy live act, I swear to Jeebus I'm gonna take a hostage.