By modern rock I mean post-90s (or at least got big in the 90s). I'm torn between RHCP and Green Day but I feel like there's still no way that they're the biggest. Is there anyone that I'm forgetting or that is a lot bigger than they seem?
I third this. There may be others that sell better, but I feel like the Foo Fighters really embody the best of the modern radio rock sound.Foo Fighters maybe?
* Coldplay: ~80M
* RHCP: ~80M
* Green Day: ~75M
* Nirvana: ~75M
* Linkin Park: ~68M
* Pearl Jam: ~60M
* Creed: ~53M
* Nickelback: ~50M
* Limp Bizkit: ~40M
* Korn: ~35M
Slipknot is pretty big, but a while ago there was something in Italy where hundreds of people played a Foo Fighters song together. I guess for a day, that was the biggest rock band.
Actually, coming up this August, someone is putting together a band in Sioux City, Iowa, to consist of over 750 guitarists, bassists, keyboardists, vocalists, saxophone players, and drummers. If you want to be a part of the biggest band ever, that'd be your chance.
Oh wait, I think I may have missed your meaning.