Add visuals to your music with the Dancing Light MP3 Synchronizer gadget.

This music light show device uses 33 multi-colored LEDs and a concave mirror to project light effects synchronized with the beat and tempo of music played from a connected music player.
A moving cylinder houses the LEDs as they flash, creating the illusion of pulsing, dancing lights. The lightshow can be set horizontally, vertically, or angled, and can be preset to one of four programs, including Andante, Moderato, Allegro, and Presto.

Hammacher Schlemmer sells the Dancing Light MP3 Synchronizer for $39.95.
The light show device requires three AAA batteries and measures 7 1/4" L x 7 1/2" D x 3" H.

This device reminds me on the LaserPod from 2004.