So last night, for some reason, I remembered the last episode of Futurama, which featured one of my favorite pieces of music (and one that I hadn't heard in a while), Chopin's Etude No. 3. That got me to thinking about other small-scale instrumental pieces that I love (I'll spare you yet another embedding of Arvo Part's Spiegel im Spiegel, but don't think I'm not thinking about it). I've put a couple in the replies. What have you got?