Robert Anton Wilson loved classical music. Here is a sample quote, from "Credo" RIGHT WHERE YOU ARE SITTING NOW: "I believe in Bach, the creator of heaven and earth, and in Mozart, his only begotten son, and in Beethoven the mediator and comforter; and inasmuch as their gods have manifested also in Vivaldi and Ravel and Stravinsky and many another I believe in the communion of saints, the forgiveness of error, and Mind everlasting."
He seems to have particularly liked Beethoven, one of my own favorites, and thanks to the Internet plenty of Beethoven is available at no cost. Musopen has free, public domain downloads available, including plenty of Beethoven. I have not examined every recording on the site, but Michael Hawley is obviously a good piano player. Obviously, some of the performances on the site are better than others.
Lots more free classical music, including Beethoven, is available here, as ogg files. (To play them, download the VLC music player, available for Windows, Macintosh and Linux).
There are also obviously many commercial recordings, and many are quite cheap. I particularly like pianist Alfred Brendel for the sonatas (the Vox recordings are a bargain), and George Szell and the Cleveland Orchestra for the symphonies.