This waltz generator was created by Audible Distortion. It is free to use.
Wolfgang Amadeus Mozart composed a waltz generator that is able to create more than 759 trillion different waltzes by throwing a pair of dice 16 times. While this was tedious to do manually, the modern software implementation will not only roll the dice for you, it also can play each generated waltz or save it as a midi file.
Thanks to the revolutionary loop mode, you can listen to a different waltz for about 481 million years. But be warned, the trillions of waltzes are assembled from only 137 different bars, so you may feel a bit like the composer is stealing ideas from himself from time to time.