Rap is music.
Most mainstream rap nowadays is utter shite, but still music. Most of it doesnt require talent, and sounds all the same or is just bitching about bitches and guns, which leads most ASBO kids to act like utter douchebags.
The early rap was really good, funky and soulful, like sugarhill gang, grandmaster flash and to an extent the red hot chili peppers.
The only rap I like nowadays is Rage Against The Machine, as they actually have something to say (about politics, wars, society etc) and is played in a funky yet hard style, so is awesome.
Majority of rap nowadays is just shite, consisting of bitches, bitches and guns, and bling ... and bitches, and the occasional girl singer doing the chorus which will sound catchy because its the same song thats been done a bazillion times, and is a cash cow
As much as I hate to say it, the genre rap is music, whether it is art is a different thing, and music should be art. Gangster bullshit douchebag "music" is not art.