Remix your music with effects like More Cowbell, Beat Reverse and make free ringtones. #1 in the App Store Japan.
Note: This works on any song without copy protection.
Mashtone is powered by The Echo Nest, a music and audio intelligence company started by two MIT Media Lab kids.
Here are some of the audio effects you can use:
Note: You'll need to use iTunes to associate the ringtone with a contact on your phone.