Yes, TruthElixirX...The Roots are another group but I went with the mainstream. Nice one.
@Chris-777: You're basing it off of the recordings in 2 Legit 2 Quit (or other songs off of his album). I'm referring to his live performances. Many rap performances (especially underground) use live musicians. Also, I've met Dr. Dre and have heard quite a bit of stuff that he layed down. While he uses a lot of samples in his songs he also composes. BTW...People who produce music are also considered as Musicians. It's defined.
The time signature of 4/4 is not the rapping but the music that's overlayed. Granted, not all rap music follows that beat structure (and rock too) but I was hoping that you'd get the gist of what I was saying. It's actually much more complicated than what you;ve stated above.
"Turntablism" is much more than scratching; far more. In fact, scratching is just one (small) component of it. The art of scratching dates back to Grandmixer D.S.T (DXT) in the early 80's but it is what it is. "Turntablism" is a newer movement that is similar to orchestrating music in real-time, organized or played sessions (similar to that of jazz sessions).
BTW...Scratching can be done using and over Miles Davis. It has already been done.
For someone who is musically trained you have a narrow view point of the art. My comment is not meant to be sarcastic nor am I speaking down to you. It's comments like "to something I could reasonably produce in a week given the time and the finances" that makes me wonder.