from: Slash by Slash with Anthony Bozza (New York: Harper Collins, 2007)
There was only one class that meant anything to me in high school; consequently, it's also the only one in which I earned an A. It was a music theory course that I took freshman year called Harmony [...] The class reduced the elements of musical composition to their roots, defining the fundamentals in mathematical terms. [...] while I was terrible at math, I was good at this.
(yes, I'm reading Slash's autobiography...)