If you have a bluetooth headset, then BtMusic will redirect all your audio to the wireless headset.

Features:

Use BtMusic to redirect device audio to a bluetooth headset
Supports listening audio books or music
Supports navigation software
Supports Skype or other VOIP software
Automatically resumes after a phone call
Automatically resumes when a headset is connected
Automatically enables A2DP (for stereo headsets)

This program is free but needs a registration at the authors page for the download.

http://www.maxmobilesoft.com/index.php/software/btmusic