VirtualDrums app lets you play all the instruments of a basic drum kit by swinging the iPhone/iPod Touch like a drum stick. Select the instrument you would like to play from the list and swing the iPhone/iPod Touch to play the instrument. Once the instrument is selected its image is displayed below the list. Instructions of how to play along with an image of how to hold the iPhone/iPod Touch is given in the information page of the application. For more information visit:
http://mayurmotgi.com.
Remember that you need to swing the device like you swing a drumstick. This usually includes an added force or jerk when the stick hits the instruments. So be sure to give a jerk at the end. The App will definitely be updated soon to play all the instruments at the same time. Make sure you are not in silent mode for sound to work.