Polyphia's Tim Henson also responds to a critique from Metallica's Kirk Hammett and offers an update on his band's next album ...

Alternative rock isn't supposed to necessarily be mainstream, but it all came to a head when everything changed in the 1990s.

The 1960s and 70s were a remarkable time for rock music, thanks to the release of classic albums like The Dark Side of the Moon and Born to Run.