Ludwig van Beethoven
The latest Beethoven biography, by Jan Swafford, is on sale this month, $2.99 for the Kindle edition. Tyler Cowen says it is "As good or better than the classic biographies of the composer." He was perhaps RAW's favorite composer, but I listen to a lot of Beethoven, too.
I bought it, but while I was trying to decide, I did a "search inside the book" on Amazon of the hardcover edition for the search term "Illuminati." Yup, 23 results!