Thelonious Sphere Monk - October 10, 1917 – February 17, 1982.
I first discovered Monk while in college, purchasing an economy "twofer" double-album compilation of his music purely on a whim and the fact that I had $10 burning a hole in my pocket. After ah, indulging in substances of unknown origin, I spent that entire night listening to those two albums over and over again. Eventually, I realized that the two LPs hadn't somehow miraculously generated over seven hours of music, but that I was hearing new things each time I replayed one of the cuts.
I found that the same thing happened even when I wasn't stoned, and became a Monk fan for life.