Well Captain a well balanced and reasonable response!
FM immune? Chasing ghosts in the average spamcan, you're more likely to have strange effects from the portable GPS than anything else. If you had a fly by wire light aircraft with electronic autopilot if might have an effect - but event that kit is supposed to be somewhat immune.....
Yes, I listen to music occasionally when flying. I've also made a couple of phone calls - to deal with unexpected PPR and 2 VHF radio failures.... for the latter the ability to connect to a headset would have been very useful. (and no, the aircraft did not fall out of the sky, the electronics spark and fry or the engine stop).