I made – or at least started making – a fair few music-based games at Zoë Mode.
Sing Hero never got much past concept phase. It was essentially a Karaoke game with voice analysing tech attached.
For DJ Hero: Afterparty, I contributed some character concepts.
On Air Guitar I was lead artist, though it failed to see the light of day, partly through disagreement on delivery with our tech partners and partly through being somewhat eclipsed by the arrival of the Kinect camera.
I also produced concept art for it.