Summary:
1. Rock music emerged some two decades before alternative sprung out of the mainstream rock.
2. Alternative rock is a sub genre of the mainstream rock genre music.
3. Alternative rock was created as a break-away by bands that didn’t sign with mainstream music labels but rock evolved from more than one existing genres.
4. Alternative includes various styles that are not typically rock and those that are hard core rock.
Read more: Difference Between Rock and Alternative Rock | Difference Between | Rock vs Alternative Rock http://www.differencebetween.net/miscellaneous/difference-between-rock-and-alternative-rock/#ixzz3SXhzbfzb