What's the biggest active rock band in the world right now?

[Thommy D.]

Considering the fanbase size, relevance and stability? Maybe there are four or five bands on top with pretty similar popular and relevance level.

[BostonGuy]

Foo Fighters, U2

[paulf]

Muse or Foo Fighters, yeah?

[KaL-EL]

U2
Rolling Stones(yes they still touring)
Jon Bon Jovi

[PAC-BOY]

Ac/dc `

[Funky_Monk]

Kings of Leon and Arcade Fire would be my shouts of the newer generation

[Thommy D.]

Kings of Leon and Arcade Fire would be my shouts of the newer generation

Bigger than Pearl Jam, really?

[Thommy D.]

U2
Rolling Stones(yes they still touring)
Jon Bon Jovi

How about Metallica? Seems like they have a bigger fanbase than U2

[Thommy D.]

Ac/dc `

Good choice.

[Thommy D.]

Muse or Foo Fighters, yeah?

No, no way...