probably only do Roar and Dark Horse from Prism maybe like the second actual single?

Katy

Gaga because she never disappoints and also we get to hear new music, Ellie Goulding and Iggy Azalea

Cause you cared beforehand...

Gaga only

Kendrick Lamar, Justin Timberlake, Robin Thicke, Avicii, Ellie Goulding, Queens Of The Stone Age, Janelle Monae, Kings Of Leon, Jessie J, Tinie Tempah, Rizzle Kicks, Naughty Boy, John Legend, Iggy Azalea...

The Line Up is pretty good.

I'm not into Gags new songs and the teaser she served, doesn't tease me at all... I might watch Katy tho she's the same night than Iggy.

I'm excited for Gaga's new material but I'm hoping I can snatch some tickets for when Katy performs

Lady Gaga and Ellie Goulding

Katy, hoping she sings a lot of new songs

Gaga and Ellie

I'm definitely looking forward to Gaga the most.

I'm also looking forward to Ellie, Bastille, and HAIM.

of course her royal highness, Queen Lady Gaga

Gaga and Ellie, and I may tune in to watch Katy and her supporting acts. It would have been useful to include all acts in the poll though.

Lady Gaga and Paramore.

I've been to the iTunes Festival twice before- once for Kanye West, once for Katy B.

It KNOCKS!

Queen of pop Lady Gaga!

Lady Gaga (Sept 1) Ellie Goulding (Sept 22) Justin Timberlake (Sept 29).

Britney Spears

Paramore and Thirty Seconds To Mars

Wait Kings of Leon are gonna perform?

I'm definitely watching.