Who said that talking at 300 words per minute was music? Maybe whatever is playing in the background...
So its music with the vocals as the center. Rap music isn't made the same way as many other forms of music. The roots are basically the only band that plays live with an mc, but all other rappers hear the pre-completed beat and then form their lyrics based on the sound of the beat. You can write lyrics a capella, but they probably won't sound correct when you try to mix them with a beat that you haven't heard before. There's a lot of work that goes into shaping the vocals to make them sound correct with the track. There's also a lot of work that goes into the production.
The difference is that other forms of music, (with bands and whatnot) have like 3-6 people trying to each do their own part together and shaping their parts as they create the song so that they sound good together. Rap generally has the producer do all of that work by himself, and then the rapper hears what he's created and his challenge is to create a vocal track that fits with all of that music.
When it comes to major releases, it is almost like cheating because there are 15 sound engineers that all collaborate to make the one rapper sound good. But that is all in the mastering process, and you often can't master something excellent out of something that wasn't good in the first place. So the process of creating the original song requires a lot of thought and effort on the part of the rapper. It is basically insulting and naive for you to say that rap is just talking fast, because as a rapper's knowledge of music expands, so will his ability to write lyrics that fit well.
You might not like the subject matter of a lot of the songs that get played, but the reality is that rap has vastly expanded the spectrum of things that people talk about in their music. I like rock bands such as the red hot chili peppers, but in my opinion it is much harder to write a nas song than a red hot chili peppers song. All of the best chili peppers songs are either just random jumbles of words or the meaning is so convoluted that you could listen to the song 500 times and have no idea what its about. Think about the most famous rock band ever. Everyone I know freaking loves "stairway to heaven" and say they've listened to it like 1000 times. Yet not one person can tell me what the song is about.
I'm not saying that a song's meaning is critical, because I like music that doesn't try to teach you lessons or be moral. But it goes to show that rap has a lot of versatility in that there can be a song about growing up and learning how to be a man, then the next song can be about killing people and robbing. And they can both sound good and each have an equal amount of work that was put into making them.
Another thing about rap is that these days, the good rappers use multisyllabic rhymes and are constantly thinking of new ways to say things. This rarely happens in other forms of music. How many times have you heard a rock song where he rhymes "girl" with "world"? Its freaking sickening after a while because they're all saying the same things, and yet everyone gets mad at rap because a lot of rappers have similar subject matter. You just can't use the radio as your basis of judgment. Most people that really like rap hate the radio. But as bad as radio rap is, the rock music on the radio these days is wayyyyyyyyyy worse and you can't deny that.
classical piano and guitar are cool too though
