For those of you who put in earbuds to listen to music, please take them out when descending through FL180 and things are starting to get busy. I remember flying with an FO who was missing one radio call after another on approach into DTW, and I finally asked him what was going on. He lifted his headset up and showed me the earbuds, and I freakin' lost it and started screaming at him. It's rare that I lose my temper in the cockpit, but that one really pissed me off. You want to listen to music in cruise? No big deal. But it had better be off by the time things get busy. Missing radio calls and not knowing what's going on because you're listening to your iPod is completely unacceptable.