I think that I fell in love with the Umineko soundtrack very early on. Towards the middle of Episode 1 in fact, with this beauty:
Core is, in my opinion, the most criminally underrated track of Umineko. It evokes the feeling of mystery, suspense, and joy of solving a puzzle so perfectly to me. I get sad when it gets seemingly overlooked in favor of most of the later songs, which I will admit, probably do leave more emotional impact on people. But give Core some love, too!