Last year, I finally got around to installing a stereo intercom. This allows for music to be played in both headsets during flight, with an audio mute triggered from the radio for ATC etc. I already had a Lightspeed 3G headset which has a direct music source input, and when flying solo I would use that input (which gives slightly better sound quality). However, for trips with a passenger, a stereo intercom was essential for equitable enjoyment (see the saga of the intercom install here).
I was using a CD player to provide music on long trips. However, last November I finally broke down and bought an iPod for use elsewhere. Currently it has close to 5500 tunes loaded, many of which cannot be purchased in any record store. (For more insight into that form of listening, see my music blog...). Now, with that many tunes instantly available, the CD player has been retired.
I tested the iPod connected to my Lightspeed 3G headset on Sunday and it works perfectly. No more CD changing in flight...less to do while sitting upstairs...I will test the iPod connected to the intercom on the weekend trip to New Mexico.
UPDATE - I am now up to 8200 tunes on the iPod, or more correctly on a second iPod...the first 80Gb iPod has been passed to a lady friend of mine for Christmas, and I now have a shiny new 160Gb iPod.