Hard rock or heavy rock is a loosely defined subgenre of rock music typified by a heavy use of aggressive vocals, distorted electric guitars, bass guitar, and drums, sometimes accompanied with keyboards. It began in the mid-1960s with the garage, psychedelic and blues rock movements.

What does it mean to be rock hard?

Wiktionary. rock hardadjective. As tough, hard, or inflexible as a piece of rock. rock hardadjective. With muscles developed and toned to a high degree, especially the muscles of the abdomen.

What does rock hard mean in text?

: very hard.