I was the one who gave that panel in 2006. It gets a bit harder to give it subsequent times because I have to pick out all new songs so the best ones have already been "used up", so to speak. Also, I had increased my staff workload for the 2007 year.
However, I may give this panel again, either at a future Kumoricon or Sakura-Con, so continue to look for it. ^_^ I'm glad you liked it!