The listing, 8-Sided "Songwriting" Dice has ended.
So the story goes, Mozart and his contemporaries used a dice game (Musikalisches Würfelspiel) to create some of their concertos — they would assign random numbers between 1 and 6 to interchangeable measures of music, and roll the dice and use the numbers to put the measures in sequence. Of course, a six-sided die is limited for a Western musical scale, so use an 8-sided dice to represent the do-re-mi-fa-so-la-ti-da scale of any key, and roll the dice to come up with a sequence of chords — in the key of C, for example, 1-6-2-4 would mean C-A-D-F. It can be a good way to keep the creative juices flowing or just for fun to pass the time on the road.