Rap IS music, though. You may not find it very appealing--indeed, I don't like rap, either. But it's still music.
I would even contend that rap music is a lot more progressive than anything else that's out there right now. There's no experimentation in a lot of pop and other commercialized music. The one thing I do have to give rap music credit for is the creative use of synthesized sounds and effects in loops (aka "beats"). If not for rap DJs, the turntable wouldn't have become a musical instrument itself.
It's a lot more avant-garde than anything else that's out there right now, that's for sure.
Now, being avant-garde doesn't make it GOOD. I find the lyrics to be empty and superficial. There is some interesting use of language, some things that resemble jibberish more than actual words, but that's about it. You know, like "I shoot the shizzle with my nizzle, busting a cap from my g-zizzle."
I was a child during the Golden Age of commercial music, which for our purposes means I remember when rap music first hit the radio. I was "Down with OPP," doin' the "Wild Thing" and drinking "Funky Cold Medina" which made "Me So Horny." I knew what part of the day was Hammertime because you "Can't Touch This," and I was "Too Legit Too Quit." I remember DJ Jazzy Jeff and the Fresh Prince. And since I live in the south, I hardly ever got to see snow; but there was a lot of "Ice, Ice, Baby."
And then there's their legacy: You wouldn't have nu-metal Linkin Park without some precedent for rap-rock fusion. You know, like Run DMC.
[youtube]http://www.youtube.com/watch?v=QgmyVLheqkQ[/youtube]
The thing that killed rap for a lot of people early on were groups like NWA and 2Live Crew, not to mention the "gangsta rappers" later. I realize that much of that music in the beginning was more for novelty or shock value, but sadly it had a lasting influence on lyrics. Radio back then hadn't gotten segregated quite as much as it is now--you had country stations, pop stations, and oldies. Once more stations started playing R&B, the pop/rock stations tended to shield us from a lot of the garbage that started creeping into the so-called "black" stations. They catered to a specific audience rather than a broader "white" or "mixed" audience, so what the rappers were doing didn't hit us enough to cause much of an uproar. I think that contributed more to the degradation of rap lyrics and the desensitization of the listening audience. The above-posted Run-DMC video would be "wigitty-WHACK" by today's "standards."
Which is exactly why I liked Kid Rock back in the day (before he became a "singer") and Linkin Park. Some of the positive qualities of current rap music has creeped into other areas of pop music, which is prevalent in new stuff like Britney Spears, Lady Gaga, etc. I find Spears to be on the cheap side when it comes to content, so I don't really listen much to her. There's just no doubt, though, that rap music is still music, though a lot of it is unpalatable for many of us. Musically there's not really anything else that's really more innovative, and you'll hear more and more influence from hip hop in "whiter shades" of music.