After years spent learning Robert Johnson and Muddy Waters licks note for note, a new generation — Clapton, Beck, Allman, Butterfield, and more — extracted the blues not out of their voices, but from t …

A-T-L burst onto the rap scene in the mid-'90s with the unique grooves of Goodie Mob and OutKast, and never looked back. Whether you prefer the eclectic sounds of Andre 3000 or the crunked-up energy of …