Here's an odd one. The Beatles rehearsing John Lennon's "Gimme Some Truth". A standout track on Lennon's Imagine LP, for me anyway, I had no clue that the Beatles even considered it. I went walking around like that, blissfully unaware for decades. I guess I don't hang with Beatle freaks enough. Here's the YouTube clip of the Beatles fucking around with it, the "official" video for Lennon's version, and a link to a page with an alternate version (along with other Lennon oddballs). If that's not enough, there's a documentary about the making of Imagine.
~ NOTE: ALL MEDIA IS HOSTED BY THE BLOGS & SITES NAMED BELOW ~Listen/Watch:
The Beatles - Gimme Some Truth (rehearsing) at YouTube
John Lennon - Gimme Some Truth at YouTube
John Lennon - Gimme Some Truth (outtake) at Big O Go there to get it, and several more. Once there, scroll down the page for mp3s.
John Lennon - Gimme Some Truth, The Making Of John Lennon's Imagine Album (documentary) at YouTube