The Free Marketplace Songs application makes it really easy to find and subsequently download free MP3's available on the Zune Marketplace. Free MP3's are usually available one at a time and for a limited period (approximately 3-5 days)
Free Tuner - Free Tuner is a chromatic tuner for tuning your musical instrument.
The tuner works with the built-in microphone,
you can set the "Auto" mode to let the tuner find the nearest
note or you can select one of the six strings of the standard
guitar tuning
Going Up? - Going up contains a magnificent selection of elevator music to suit your elevator riding needs. The soothing sounds of piano and other acoustic songs are specially picked for this app. There are 8 tracks to choose from, every one about 2 minutes in length, so there are no annoying short samples!
Use the alarmbell for a good scare, or for plain annoyance
Grantophone - Please visit my blog at http://grantkot.com/blog to see a video demonstration. This experimental instrument is basically a cross between a theremin, piano, and organ. The keys are colored the same way they would be colored on a piano/organ. Then there is the theremin-like part where you can do smooth slides and you're not limited to the notes you can play
