Biggest Music festivals

When is Lollapalooza? Who is headlining Governors Ball? When is ACL?

Lollapalooza. Bonnaroo. Coachella. Sasquatch! Summer music fests are hard to keep straight sometimes, so we've done all the straightening out for you.

For instance, did you know that Austin City Limits' two weekend lineups aren't EXACTLY the same? And which other gatherings are four days - or longer? And can you guess which dance music festival still hasn't revealed its lineup, despite festivities being only three weeks away?

AND JUST WHERE ARE YOU GOING TO SEE DRAKE, HUH?

Wear sunscreen and stay hydrated. Welcome to the official start of summer, fest-goers.

Music Festival Guide: The Who, Where and When Of Summer 2015's biggest fests

After five years as a columnist and editor at Billboard, Katie Hasty joined HitFix in 2009 for music and film reporting out of New York. The Midwest native has worked as a writer, music promoter and in A&R since 1999 and performs with her band Numbers And Letters.