nbc's deborah roberts reports. ♪ in the city ladies look pretty ♪ >> for years, rap music with its rawheard mainly on the streets where it was born. then it moved to mtv. but now, move over, gentle jingle. rap is ripping through commercial land, selling everything from soft drinks to sneakers. >> oh, my god. hip-hop is documented in real time, the stories>> stands as at freedom of expression is one thing, and even the supreme court cannot take it from us. joining me now our to johnson hip-hop fab 5 freddy and carris one, thank you both for being here. i was just laughing at, this washington the today show explaining hip-hop was one of the funniest things i've ever seen, i found very hilarious. very hilarious,choice they made. lord jesus. i've gotta go to you first fab my friend, you are part of building his hip museum, which i can't wait opens and i can go see it. can you give us your, since having been around from day one, what has hip-hop meant to black music and to america? >> you know, it's amazing joy. i'm home in harlem right now, i think about this often the fact that hip-hop ca