Where did rock music Come from?

There is alot of Clical influence in rock as well......from the very beginning of heavy metal...that emblage of disparate musical styles known...as 'clical music'" has been another important influence on the genre", in addition to blues and R&B. He claims that "throughout metal's forty-year history, its most influential musicians have been guitar players who have also studied clical music" who "appropriat[ed] and adapt[ed]...clical models" into heavy metal.