Who said the GBC sound synth can't churn out some sweet tunes?
The games in the Castlevania series have always been known for their excellent and memorable tunes, and Harmony of Dissonance is no exception. While it's true that the game directs most of the GBA's available power towards graphics rather than music, the composer did an excellent job despite this. After all, some of the best music in video game history was done using the NES's inferior chips.
First up we have the game's first BGM (and one of the few BGM's with an official name in the sound test): The Theme of Juste Belmont (662 K).
The second track is from the Marble Corridor. Considering how memorable the Marble Corridor music from Symphony of the Night (PSX) was, this track had some big shoes to fill. I'd say those shoes were filled nicely: Marble Corridor (821 K)
The next theme is used in a few different parts of the castle. It first crops up in the third major area you're allowed to fully explore: The Castle Treasury (547 K).
Finally, we have one more tune from the middle of the game. This is from the right most portion of the castle in the area with the epic cloud background. Behold The Chapel of Dissonance (537 K).