I'm currently working on and/or starting to work on two particular projects involving StepMania (you know, that music game engine everyone loves?), which I smartly both branded under the blanket title "TrotMania"
First, there's a theme (which I actually, right now, need some artwork ... and menu music help for), and also I've begun to organize a collabrative DDR-style song pack project for it too.
Since this seems to be the primary forum for pony musicians, I'm thinking I might be able to help find somepony or two, or three, or more who could help out. I'm working extra hard on the theme too, because it may end up being one of the StepMania 5 themes that will finally trigger a mass exodus from 3.9 (because well, everypony else uses those 3.9/3.95 forks)
If you have questions, don't be a Fluttershy and be afraid to ask!