I don't consider Rap, per se, as music. It's spoken word and I have always believed that it is a throw-back to the African griots, and a verbal form of improvisational jazz. Music soothes the savage beast but rap incites it with its hypnotic cadence.
Not surprising, I never got into gangsta Rap or Rap as political commentary. I like the carefree renditions like "It was a very good day" by Ice Cube and the "I got my mind on my money and my money on my mind" by Snoop Dog. And I do like Lil Wayne's rhymes because I think they are very clever. He a good punster, too, and I love puns. Tthey tell me Kanye and Jay-Z are masters of the art, and I assume this is true.
My generation goes back further than the Temptations. It goes back to the extremely melodic ballads of the 40s and 50s which compile the "Great American Song Book", old standards as interpreted by vocalists like Nat Cole and Ella Fitzgerald and Johnny Mathis and Sarah Vaughn - Frank Sinatra and Nancy Wilson and, of course, Billy Holiday. And the thing about these songs is that their lyrics are so exquisite that they stand on their own without a melody. Compare the zeitgeist of that era with its music and there is a correlation. So, music does define a generation.
I remember when I first heard "When Doves Cry" by Prince. It left me cold. No base line;sung in a monotone; cryptic lyrics. Of course, my kids loved it. Guess why? Me, I preferred "I wanna be your lover" and When you were mine", naturally. Prince, however, is in a class by himself. But he's a terrible rapper, IMO.
Music is the universal language. For me it is divinely Zen. It fills the spaces between the lines.