A game of H-O-R-S-E or S-K-A-T-E but for musicians. One improvises a passage and the other has to perform it on a first listen. If succesful they perform/improvise a new passage that the other musician has to perform. If unsuccessful you get an M and first to spell M-U-S-I-C loses. This will not only allow you to determine a musicians aurul, performance and improv skills but also be a good way to practice and compete with others. I challenge every artist on the billboards.