For nearly a decade, animations of computer programs have enlightened and entertained viewers. Algorithm animations have proven to be useful for teaching computer science courses, designing and analyzing algorithms, producing technical drawings, tuning performance, and documenting programs. Just as useful (and equally entertaining!) are auralizations of programs. We have experimented using audio for reinforcing visual views, conveying patterns, replacing visual views, and signalling exceptional conditions. Sound does not merely enhance the beauty of a presentation; it can be used to give fundamental information. Now, it is hard for us to imagine trying to convey sufficient information in algorithm animations without sound, as we used to. This multi-media presentation will review our efforts in algorithm animation and auralization.