Note: Halfway done (unfinished ;), approximately 3 minutes 50 seconds. By halfway done, I mean half is going to be replaced. You composers know what I’m talking about. In the meantime, I strongly suggest you check out Caroline M. Breece’s works. If that isn’t enough (it really is, but I know you google-holics), her husband, Michael G. Breece will take care of the rest.
Addendum: There will be exactly four toy piano works. This is not a sonata, not in sonata-form. You can Youtube for a full symphony of the toy piano. Although you might find, as I did, bad luck in hearing the unfortunate toy piano above the symphony. Impressive work, nonetheless, and a wonder to watch a pianist contort him/herself into a sort of cartoonish pose, which must be extremely uncomfortable.