Mozart Dice Game more commonly known as Musical Dice Game (Musikalisches Würfelspiel in German) is a system in which dice is used to generate music from precomposed options. In 1787, Wolfgang Amadeus Mozart published a musical composition entitled "Musikalisches Würfelspiel", or "Musical Dice Game". This composition allows one, as Mozart puts it, "to compose, without the least knowledge of music, so many German waltzes or ländler as one pleases, by throwing a certain number with two dice." Though this idea had been tried by many other composers before Mozart, it was Mozart whose work became popular and has been mostly attributed for this work.
The musical dice game consists of 272 short measures of music and a table of rules used to select specific measures given a certain dice roll. The result is a randomly selected 16 bar minuet and 16 bar trio. In some cases (such as this version) in stead of a two-dice combination, a random number is selected between 2 to 12 which works the same way.
This game is in public domain. You can get more information in the PDF. Read further background about it on wiki.