Rifff, the top interactive music show on MSN, is unlike anything else so far on the net...
Featuring a different artiste each week, the core of the show is an original piece of music with its own completely interactive 'ImproVision' - where viewer's clicks drive both animations and music. This is definitely the closest thing to truly 'interactive video' you will have seen.
Original real-time generated music plays throughout the show, and there is another music machine - the Faloopinhymer(!) - that allows visitors to 'conduct' all the component musical parts in their own live performance.