What is Rock music?

[moombasista]

What is considered to be rock music these days?

Is it The Rolling Stones? Is it All American Rejects?, Dashboard Confessional?, My Chemical Romance? John Mayor?

Is it hitomi or OLIVIA? ayu?

I've seen people group Madonna, Shakira, Norah Jones and Mary J. Blige as "rock queens"



So what is rock music? Is it anything with guitars? Is it anything that's "hard/now/edgy"?

or could it be everything?