When rap came out 30 years ago I thought it was just a fad

In my area rap don't dominate any population or ethnic group.
Black population mostly listens to jazz, soul and classical. Hispanic population mostly listens to heavy metal and white population listens mostly to classic rock. Rap is rarely heard from any private homes or car stereos.
To my taste, I can't even call most of classic rock music or I can't even pronounce "Rock Music". Rock is rock, Pop is pop, Heavy Metal is heavy metal Rap is rap and Music is I guess something else but rock, pop,  rap or heavy metal.

my old friend told that the word rap is actually misspelled...