I’m sure you heard of the major minor music game. It was posted on the music-ir list and Paul has blogged about it. You probably also know that Paul recently lost his lead (he had the highest overall score for at least a week I think), and that many other researchers (including Martin and myself) had made it into the top 10 at some point.
The clever game was also mentioned on the Listening Post. It would be nice to see it climb high in Digg’s playable web games section.
Maybe such games could be the solution to automatic segmentation, music classification, maybe also music recommendation, and replace various other content-based techniques we are still working on?
Instead of teaching computers how to understand music we just need to find clever ways to motivate those 8.5 millions playing World of Warcraft to play similar games. I think that might even solve the various scalability issues Jeremy and Paul mentioned recently.