I was tossing a few ideas around in my head about the game lately, namely general rules for an Audiosurf friendly song(for when I introduce it to pals). The basic rules I've come up with are this.
1. Has to have a lively beat OR no songs with traffic congestion less than 50.
2. Has to be a reasonable length OR longer than a minute and less than 15.
A lot of these will be completely opinions, but I want to get the community's general view on this. I know some people may like playing mellow 25 minute songs, or 45 seconds of solid windows "ding" on ninja mono, but this would be general guideline for most modes/difficulties.