Perhaps not exactly what Jeff was going for, but I have experienced migraine-inducing music. Giacinto Scelsi's string quartets and Allan Pettersson's symphony #13, to be specific. I claim no scientific findings (I haven't been terribly motivated to try and reproduce the results), neither do I claim any correlation to this and the quality of the music. In fact, I'm not really sure what this says about the music, or me for that matter. I'm much less familiar with Scelsi's works than I am with Pettersson's. I've heard most of Pettersson's symphonies, the violin concertos, and some other orchestral works, and haven't had a similar reaction. Luckily, with modern pharmacology, nothing seems to induce migraines these days. Dave http://www.classical.net/