Good news and bad news...

The bad news first: No one has guessed the band!
Well, that's actually good news for most of you 
The good news: 2 attendees can still win the "meet and greet the band" prize.
And even better news: We are allowing everyone a second guess.
That means 2 guesses per person.
Same rules apply as before and options to submit your guess. (see original blog for details)
Now, for some hints...
+ 4k shows to over 25 mil people
+ 30 mil records sold
7 top Billboard hits
Who's the band?