A few years ago, Pandora introduced its "Billionaires" program, a way to reward artists who achieved over a billion streams on the service, presenting them with a special plaque, akin to going platinum.
Recently, Pandora announced the launch of Hard Rock Billionaires, a new station honoring hard rock and heavy metal artists who have achieved the honor.
As for the hard rock bands to crack the one billion mark:
Linkin Park
Three Days Grace
Breaking Benjamin
AC/DC
Nickelback
3 Doors Down
Metallica
Seether
Disturbed
Five Finger Death Punch
Shinedown
Staind
The Black Keys
Skillet
Evanescence
Korn
Foo Fighters
Daughtry
Rise Against
Godsmack
Tool
Incubus
Chevelle
Cage The Elephant
Papa Roach
Stream the station here..