Germany Rock Concert Green Day

In this picture made available Sunday June 9, 2013, Billie Joe Armstrong, of US band 'Green Day' performs at the 'Rock im Park, festival in Nuremberg, Germany, Saturday June 8, 2013.

(AP Photo/dpa, Daniel Karmann)

"I got two words to say: 'Deep Purple.'"

That's Metallica drummer Lars Ulrich talking to Rolling Stone in April about the Rock and Roll Hall of Fame.

The pioneering hard rock band was left off the Rock and Roll Hall of Fame's ballot altogether this year after receiving a nod the past two years. The nominees, announced this morning, includes Green Day, Nine Inch Nails, Sting, Lou Reed and Bill Withers, among others.

The HOF has become a sort of crusade for Deep Purple fans, who rant and rave year after disappointing year as their band is left out of rock's -- ahem -- prestigious institution.

Of course, Deep Purple isn't alone. Every year fans gripe about which artists got the snub. After all, an invitation to the Hall is more for the fans than the artists. It's the reason the Sex Pistols called the whole charade "urine in wine" in their refusal to accept induction in 2006.

Still, it's a shrine to those who have influenced modern pop and rock music. And it's a reason to talk about who does and doesn't deserve it.

So here are some talking points about the bands that made the list and those that didn't. Feel free to add your own complaints or gripes below.