I used to hate rap completely. I could deal with Rage against the Machine, but otherwise I avoided it like the plague - mostly because I hated the subject matter and thought it was never well-put together.
Guante's music changed that. I still don't like any rap I listen to other than Guante, but thanks to him I'm looking, and I know there's more out there.
tl;dr: he shifted how I viewed a genre of music.