From a hologram of Tupac to a surprise performance by Rihanna, check out some of the most memorable shows so far below!
[Rihanna][Katy Perry, Rihanna][Rihanna, Katy Perry][Avicii][Snoop Dogg and a hologram Tupac][The Horrors][Beirut][The Hives] [The Weeknd][Florence and the Machine][Radiohead] [House of Balloons]