Miles Davis.
I didn't like his muted trumpet sound or his stuff with Gil Evans or Birth Of The Cool when I first heard it. What happened was the part in Burns's History of Jazz where they show the 2nd quintet playing Gingerbread Boy (I believe), I thought that riff was so cool. A friend of mine had a radio sampler of the box set with that song on it. I liked everything on it so I slowly went further. After I realized his muted trumpet sound was as annoying as I first thought, I opened myself up to all his stuff (up to 1975, I'm not going to bother with the 80's stuff). Now I can't wait till all the box sets are out! I dislike that box #3 (1963-64) will be the last one as I've been recreating the original albums on tape for my car, and can't go any further until that box is out.
Ornette Coleman & Prime Time.
It's the same idea as his acoustic stuff, just electric. I liked Body Meta because it was so crazy.