Provided is, among other things, a system of musically interacting devices. A first device has a first identification code, a first wireless communication interface and a first audio player, and a second device has a second identification code, a second wireless communication interface and a second audio player. The first device and the second device are configured to participate in an interaction sequence in which: the first device wirelessly communicates using the first wireless communication interface, the second device wirelessly communicates using the second wireless communication interface, a musical composition is selected based on both the first identification code and the second identification code, and the first device and the second device cooperatively play the musical composition, with each of the first device and the second device playing a different part of the musical composition.
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