As a freshman in college, I was just starting to figure out music and the first time that I actually understood that music wasn't just a big ball of sound but the interplay between distinct musicians was when I first heard the Paul Butterfield Blues Band. I saw a lot of them; they were practically the house band at a club I worked at, the Cafe Au Go Go. Their style of Chicago blues was a strain that helped define rock'n'roll. Their debut, eponymous album was released in 1965 while I was seeing them almost every night. They did an Elmore James song, "Shake Your Moneymaker," which has been covered again and again. Butterfield's version will always be my favorite... yeah more than Ludacris', although the Fleetwood Mac version is pretty good.