To quote Bill Haley, who prety much invented rock, it is volatile mix of country and
pop. At least, originally it was. It has its roots with black R&
B dudes and folk singer type guys. Then white
people started mixing it with country &
pop (see above), and it started to become rock 'n' roll. Starting in the mid '50s, people such as Chuck Berry, Buddy
Holly, Elvis Presely, and others created a whole new genre. In
teh early '60s, surf bands like the Beach Boys and others started chaning it a bit. y the late '60s, it started to lose sight of its purpose. Hippies started transforming it from realtively
short and fast songs into long, slow, boring songs about God-knows-what. By the '70s, bands like the Ramones starting to bring it back to its roots, only with a harder edge. Around this
time, metal was created. Metal is hardly rock. Then it got
pop-ified in the '80s, then it transformed into a bland, repetitive, boring commerical music in the '90s, finally being pashed out of mainstream society by metalheads and ganster rap people.