I have a degree in Music History, so music is my area of trained expertise, specifically classical, but I was into ALL music - jazz, world, rock, bluegrass/folk, rock, etc. I graduated in 1982 (and made a living in the classical/jazz music biz for 30 years), and kept studying other areas of history, particularly American History, and specifically American war history, especially the Revolution, the Civil War, and WWII, and also Politics.
Today, I consider myself a general historian, with a personal love of music.