Above all, COBRA is a musical experience. Words cannot convey. Listen, just listen, and you're liable to find yourself lost in the magic of the game, and the music. Cobra is an unpublished but recorded and frequently performed musical composition by John Zorn that was conceived as a loosely structured system, or game piece, for a group of musical improvisors and a prompter.
Zorn completed Cobra on October 9, 1984. The composition consists of a set of cues notated on cards, and rules corresponding to the cues that direct the players what to do. The number of players, instrumentation, and length of the piece is indeterminate. Because there is no musical notation and the players improvise, the piece may sound radically different from performance to performance.