"Dear Coachella WTF (what the f**k) happened to Daft Punk?! I wanted to get my Tron on! Needless to say, I'll still be there w/glowstixxxs (with glow sticks)." Katy Perry is disappointed the dance duo has not been added to the Coachella Festival line-up - but she is still looking forward to the event, which will be held in Indio, California from 15 to 17 April (11).