John Legend is modern R&B's classiest male singer, bringing old-fashioned suavity to hip-hop soul; the Roots are the world's most versatile (and maybe best) band. Together, they have made a brilliantly conceived and executed album, reviving music from the Nixon-era heyday of politically engaged R&B. Bustling through funk, Philly soul and gospel, taking on songs famous (Marvin Gaye's "Wholy Holy") and obscure (Mike James Kirkland's "Hang on in There"), Legend and the Roots capture the old feeling of protest and uplift while updating the sound. They're not imitators — they're heirs.

“All Along the Watchtower”

Jimi Hendrix got hold of Bob Dylan's early John Wesley Harding tapes and in late 1967 recorded a version of "All Along the Watchtower" with the Experience in London. Dissatisfied with that first development, Hendrix brought those tapes with him to New York in early 1968 when he began work on Electric Ladyland. Eddie Kramer, Hendrix's engineer at the time, told Rolling Stone that Hendrix "was still looked upon by his basically white audience as the mammoth black guitar hero. There was a constant fight within him to expand himself." Hendrix's successful take on Dylan's work has long been recognized by the songwriter. "I liked Jimi Hendrix's record of this and ever since he died I've been doing it that way," Dylan wrote in the liner notes to his Biograph box set. "Strange how when I sing it, I always feel it's a tribute to him in some kind of way."