Headliners: (I don't consider Pink Floyd or Led Zeppelin possible at this point) 2. John Mayer (preferably JM Trio) 3. Incubus
PF and LZ reunions are so unlikely and even if they happened. They wouldn't play festivals when they can sell out every major stadium in seconds.
Mayer and Incubus are two of the best live acts I've ever seen. The majority of the public only knows their 3 shiztiest songs. Mayer is possibly the best touring blues guitarist and A Crow Left Of The Murder by Incubus might be my favorite album start to finish of all time.
Mayer is possibly the best touring blues guitarist
Whoa, wait. Where would you put Jonny Lang, Gary Clark Jr., Derek Trucks, Samantha Fish, Davy Knowles, Joe Bonamassa, Ana Popovic, Joanne Shaw Taylor, Kenny Wayne Shephard and Susan Tedeschi in the current blues guitarists rankings? I'll leave out Clapton, Haynes, and Guy for now (age and genre concerns in re touring).