Musical genius. With a few clicks, the new Genius feature sifts through the library to find the pieces that go great together and give you a perfect playlist. Rock and roll. With built-in accelerometer, you can rotate iPod nano to a horizontal position to scroll through album art in Cover Flow, watch movies in widescreen and view photos in either portrait or landscape. Stir in case of boredom. Shake your iPod nano to switch to a different song in your music library.