Animusic brings the theme of timing animation to a particular soundtrack to a whole new level. Founded by Wayne Lytle in 1995, he and co-founder David Crognale have produced a new style of visualisations where "the music drives the animation" - quite literally according to the programmers.
Mixing stunning, imaginative CGI with incredible Midi-based scores, Animusic was released on DVD in 2004 and 2005 respectively as a series of music videos - originally intended for music/animation enthusiasts, they have since become popular for all ages. Wonderful stuff for the imagination if you're after something different =)
Check out a few videos from the DVDs, including the earliest Animusic video that set the ball rolling - More Bells and Whistles: