Musician in a rock band.
Headline ALL the festivals!
Preferably with a fanbase more like Enter Shikari's than, say, Muse's.
ES Fans, while there are distinctly fewer of them than most other bands on their 3rd album, all know nearly every song and sing along and get involved with all of them.
With big bands like Muse, everyone knows the hits, sure, but the older songs or even the newer ones that aren't singles are often left underrated.
I'd rather play to 4,000 people who rock out to even the B-sides, than 40,000 who don't know anything that wasn't a single.