Well, Chris, the criteria for being hip hop music does appear to be very blurred. I have a problem with you using hip hop and its bastard child, rap, as interchangeable when making your point. To say that hip hop is musical does not make rap, music. And it's like you determine a song to be hip hop if the person performing it has a MC in front of their handle, or otherwise identifies themself as belonging to the hip hop nation. To me. such music does not stand alone as being hip hop, and the only reason it can make such a claim is because a rapper is fronting it. (BTW, I always thought Lauren Hill’s was striking a blow for feminism rather than hip hop.)
Or, is this to say that rappers can’t sing. I’m simply contending that you can’t sing and rap at the same time, so when a rapper breaks out in song, he/she is doing this between rapping. I repeat. Just because music is played or sung or sampled in the background when a rapper is rapping, does not mean the rapper is singing. As you allude to, when a person sings, a musician can listen to the melody and score it with notes on a staff so that another musician can read this and play it on an instrument. Can this be done with rap spitting? Or record scratching? I would think that rap purist would not want it classified as music. Art form? yes; Music? No.
I know, I know, I’m getting technical. Which is a no-no in the hip hop culture with its “keeping it real” pretensions. (time for an emoticon) Just because I don’t take hip hop as seriously as you do, doesn’t mean I’m dissin’ it, however. This is a generation gap, of course. I’m disappointed with the younger generation of Blacks for marginalizing Jazz and the Blues to embrace the minstrelcy of hip hop that includes the babbling of rap. But I still take pride in the diversity of black music. Rap on.