FluidTunes

FluidTunes is an extraordinary application for OS X that lets you control the cover flow interface with iTunes in a physical gesture in front of a webcam.

FluidTunes includes four gesture controls: Two of them let you browse albums on the left and right, and the other two start playing the music and it closes.

Although the albums seem to be similar, they are not; Each song in the album is shown separately with album cover, so you can see the same image as a bar in the row. FluidTunes performs well when your hands and the contrast between the background are strong.