Singer readies second-annual charity event.
Duo recreates famous video for The Tonight Show.
Veteran performers with enough hits to rock Sin City.
Luke James serenades Beyonce's mom's wedding, plus more.
Nas is the latest musician to bump heads with the IRS.
Lionel Richie, Kanye West, Azealia Banks, Deadmau5 and Run the Jewels among festival performers.