Rock 'n' roll seems to nestle an almost infinite number of distinct musical genres under its very broad umbrella, but when one of those genres hangs around long enough – as heavy metal has for close ...

These pop songs didn't fit the pop mold, and they created, or at least boosted, the popularity of whole new subgenres instead.

These legendary country songs played a big part in making a few then-new subgenres as popular as they are today.

Michael Loccisano, FilmMagic/Getty Images / Roy Rochlin, Getty Images / Jesse Grant, Getty Images / Tim Mosenfelder, Getty Images / Bill Moreno, Sygma via Getty Images / Burak Cingi, Redferns / ...

Before diving into subgenres, it’s important to first have a complete understanding of what film genres are on a fundamental level. The easiest way to think about genre is as a category or type of ...