First and foremost comes the music to me, which includes the vocal inflections. How words are sung and how they fit in a poetic scheme are more important for me than the actual lyrics. Oddly enough, when I write songs, I put about 80% of my effort on the lyrics and end up mumbling like a 1983 Michael Stipe.
Late 80's/early 90's hip-hop is different however. I'm all about the battle rap lyricists.