The tunes probably have QT icons b/c it may be how you have your file exchange setup. As for burning, you didn't tell me which burner softw you used. I'm guessing it was Disc Burner right? I do remember there was some issues about this which is why I always carried Toast around with me whenever I visited a mac. I'm in osx at present (& it doesn't open in Classic environment) so you'll have to wait 24 hrs for me to check it out. May I suggest you locate your Disc Burner & go to the menu bar & find Preferences. There should be an option for burn speed. Change it to the least (eg: single speed.) I think the default is for maximum speed! The problem is that some earlier burners didn't like audio disks burnt at high speeds (my 1st one would only allow single speed else it would ONLY play on my computer like you said.) In fact, even for today's very fast burners there can be issues burning audio disks at the highest speeds. You should choose Audio format. Standard is for data only & mp3 for mp3 players/dvd players only.
By the way, you should have posted this in your previous thread. I left questions there for you but you didn't reply. For the same topic stick to the one thread. It makes it easier for us to relate to all previous info & issues.