From June of 1964, please enjoy the original r&b version of "It's All Over Now" by The Valentinos (featuring co-composer Bobby Womack on guitar and lead vocals)...
...and then from a month later, the Rolling Stones' pop cover.
I bring this up partly because I love both of these, but also because the Stones record kind of gives the lie to the cliché about white rock musicians ripping off and diluting the work of black artists blah blah blah. The Valentinos original, wonderful as it is, is positively jaunty, as if the singer was secretly amused by the fact he's done with the woman in question, while the Stones take -- done with the identical instrumentation, i.e. two guitars, bass and drums -- all but drips anger and, frankly, menace. Which is to say the Stones totally made the song their own, and no apologies needed. (Womack, of course, was delighted with the large royalty check he received after the Stones version went Top 40.)
It is also worth noting, I think, that the fade-out at the end, with those circular guitar figures (repeated over and over with only the tiniest variations) is for all intents the first real example in pop culture of the musical esthetic we now refer to as Minimalism.
A final bit of trivia: The Stones were turned on to the Valentinos original by legendary New York DJ Murray the K. "We thought he was a cunt," Keith Richards told Rolling Stone some years later, "but he gave us a great record."