My son is working on an experiment for his high school neuroscience class to explore synesthesia in people and you can help. Please go to henrycrawford(dot)com and answer a few question about music and colors. It’ll only take 3 minutes or so. In his words:

"Synesthesia is when two or more senses intermingle with each other for
instance one might see colors while listening to a song.

In my experiment subjects will listen to 30 second clips of 5 songs and then
pick from a choice of 5 colors (red, green, blue, yellow and grey).

The experiment is running through midnight Monday May  19, 2008.