Beninoise singer Angelique Kidjo performs with Josh Groban, Dianne Reeves, Branford Marsalis and Vampire Weekend's Ezra Koenig. Included: "Summertime"; "Pearls" (with Groban); "I Think Ur a Contra" (with Koenig); "Gimme Shelter" (with Reeves); "Move on Up" (with Marsalis); "Redemption Song."