One of the classic iPhone apps, the Ocarina, has a beautiful end of year promotion: for 72h it will be free in all App Stores in the world (including the Brazilian one).
For those who do not know, the application allows you to take sound from the iPhone by blowing into the microphone, turning it into a real musical instrument. A guaranteed way to impress friends and family. ?
Check out a demonstration of it:
Ocarina is compatible with all iPhones, iPad and iPod touch that have a microphone. iOS from version 3.1.3.