The 'Best Of' album, 'Death to the Pixies' is full of classics, but if I had to choose one it would be Track 14 'Where is my Mind?'. Its haunting and uplifting at the same time, its got that epic feel to it which makes it seem like more than just a song, plus it kicks arse simply as a rock song! Not sure if I understand entirely what its about, but heh, music is also just about an emotional experience.