I just got a nice holiday email from Alex Komorov, the publisher of Accordéon, in which Santa plays Jingle Bells on the new Christmas version of the virtual accordion for the iPad. The holiday version costs US$3.99 and is decked out for the holidays. It includes a learning center where you can learn to play popular songs easily since the keys are lit up directing you what to push.
The only holiday song at present is Jingle Bells, which you can see played after the break. There is also an iPhone and iPod touch app called