I read Uncle Bobs blog about him recording a Katacast of Prime Factor kata in Ruby, with music. (His main point, and my own when I speak about TDD and katas, is of course that to become a professional you really need to take your practicing seriously, only then can you excel!)
I recommend a read for any of you coders out there. Then you can visit the Katacast website for some more examples.
Strangely, this much resembled what me and Andreas did at XP2009 on the session that Emilie Bache organised, although without music. I coded and Andreas commented. We had decided on trying for the complete Bowling Kata in Java with Eclipse so we had to do exactly what Uncle Bob said he had to do, practice, practice, practice and optimize, to fit it into the 20 minute slot we got.
Again, like Uncle Bob said, it was great fun! I very much enjoy working these things with Andreas, we seem to complement each other well.