'Back in Black'! Watch AC/DC's Brian Johnson sing with Muse amid hearing loss recovery
Johnson performed on stage for the second time in three months
Lorde 'gutted' after Lollapalooza evacuated amid severe storms
Performances by headliners were cut short
Bob Dylan, Chance the Rapper, and the Weeknd to headline Firefly festival
The lineup also includes Muse, Twenty One Pilots, the Shins, Flume, and Kesha's first announced show of festival season
Muse drone crashed into the audience at a London gig
No one was hurt
