Take a look as guest at the Cirrus Pilots forum,
www.cirruspilots.org, there are a number of threads
relating to adding MP3 players, CD players, radios
etc into the Garmin 327 panel.
In the UK with our complex airspace this is something
best listened to by the passengers but in the US it
is quite common to have the pilots listening to an audio
feed on top of a monitored circuit, set up so the audio
drops out when the monitored circuit is active,
-- Andrew