Music information is output to an operator, such as a vehicle operator,
through the use of a portable electronic device. The operator's behavior
may be determined on the basis of data received from one or more systems
of a moving object which is being controlled or otherwise operated by the
operator. One or more individual pieces (or playlists) of music may be
respectively stored as music information, for example, corresponding to
different detected behaviors or moods of the operator and/or the
operation conditions.