Fifty- five years ago today, the Rolling Stones' fourth album, "Aftermath," hit number 1 on the U.K. charts. It was notable in that it was the first of their albums with all compositions by Mick Jagger and Keith Richards, and for the experimental structures and tones, largely thanks to the variety of instruments played by Brian Jones (like the dulcimer) that you wouldn't normally hear on a Rolling Stones album. Oh, and also it had some of their best music. Here are "I Am Waiting" and "Lady Jane" (the original mono version).