I love the current trend of music animations. We posted the superlative Rite of Spring animation below, but this simple one I especially love, because it not only helps the aural patterns make more sense (we are visually dominant in our perceptions, after all), but reveals a little bit of the actual compositional process, too.
Anyone who has studied tonal counterpoint knows that the all-time undisputed master craftsman is J. S. Bach, and The Musical Offering (BWV 1079) is a pretty clear example why. Here its most essential idea is presented in way that helps one hear and understand the nature of a so-called 'crab canon':
Now here is the music in context--try and notice if the little animation above helped you better hear the process Bach is putting the thematic material through:
Canon 1 a2 (Canon Cancricans)
(played by the superb Ensemble Sonnerie)
Pretty neat, right? A few more interesting animations below the break: