Admittedly, I haven't played this game, but would love to.  My knowledge of the game is basically through watching other people stream the game and it looks fun as hell.  Being as it came from Atlus, the same company that made Shin Megami Tensei, I'll definitely play the game in the future.  I like my puzzle games.  I have been listening to the soundtrack for this game lately on repeat.  If there's one song that I would pick out it would be "Revolutionary Etude."  The Catherine Sound Disc came in the Deluxe Edition of the game with a pair of boxers worn by the main character, a shirt, and an artbook.  The album was created by Shoji Meguro.  To my knowledge, the album is a remix of classical music.  "Revolutionary Etude" was done by Frédéric Chopin.  Also known as the "Etude of the Bombardment of Warsaw," the song came about during the November Uprising, which was Poland's failed revolution against Russia.  I find that this piece is one of the better ones on the album although all of them are good.  I would also go back to Chopin's original Revolutionary Etude, which is Etude Op. 10, No. 12.