Individuals share music through portable audio devices that synchronously
play music by transmitting music signals from one device to the other.
Upon request, other individuals can join such a sharing group as a
member, and these new members can either be accepted automatically, or
through voting by existing group members. So that members of a group can
converse, the fraction of ambient sound admitted by the earphones of the
portable device can be manually set. In order to enhance the enjoyment of
the music, wearable transducers, such as light emitting diodes, respond
to signals related to the beat of the music. Signals can be automatically
generated, or manually specified, and signals thereafter stored for
playback with the music to which it is related. Wearable transducers
associated with individuals at a large music event can be set to receive
common signals such that the transducers respond in synchrony with one
another.