At http://www.cbc.ca/spark/2011/09/spark-156-september-25-28-2011/there is an interview with someone named Leonard Paul who does music for video games and writes chiptunes - the C64 is mentioned 3 times.
If you also click on the name "Leonard Paul" you go to his website and under "Presentations and Writings" - scroll down and there are a couple of articles which have d64 images as downloads. I didn't check what they included.
Ernie