def leppard

There's way more substance here than haters would lead you to believe.

The genre's best bands had a penchant for reinvention — making this list especially difficult.

Do you know your ABCs of Rock? We hope so as there are well known rock bands for every single letter of the alphabet.

The subgenre packed a harder punch than its detractors were willing to admit.

Some bands did not fit the hair metal mold, but played along convincingly enough for at least one album.

Are these bands hair metal or not? History lumps them into the subgenre, but there's some arguments to be made against it!

Rock still rolls through the years.

The best of the best, year after year. The rock world has evolved quite a bit from 1970.

Come see all the songs that these big rock and metal bands only played live once!

Try picking only 25 rock + metal albums from each decade that you would want to ensure your kids listened to. It's a harder exercise than you might think.

All praise, as these songs not only made a big impact upon their release but have stood the test of time to remain pop culture staples for years to come.

Def Leppard's Phil Collen celebrates their latest song, 'Just Like '73,' dives into the 40th anniversary of 'Pyromania' and hints at what's next for the band.