The Magic Cube described in this paper is an interesting example of the tangible interactions paradigm to listen to music. It's designed by Miguel Bruns Alonso (ID StudioLab, Delft University of Technology).

Listening to digital music on a computer has led to a loss of part of the physical experience associated with earlier media formats such as CDs and LPs. (...) To return part of this physical experience a design named the MusicCube is presented that visualises several content attributes of Mp3 formatted music and makes control access more tangible. Play lists, music visualisation, volume, and navigational feedback are communicated via multicoloured light displayed in a tangible interface. Users are able to physically interact with music collections via the MusicCube, a wireless cube-like object, using gestures to shuffle music and a rotary dial with a button for song navigation and volume control. Speech and non-speech feedback are given to communicate current mode and song title.

The usage is pretty curious:

Why do I blog this? this gives somes ideas about how tangible interactions could be used, might be useful for new projects about defining a grammar of possible interaction with objects (and hence with the wii controller for instance)