Something slipped through the quality control re iTunes. One album of instrumental music should have had 9 tracks on it, the longest being over 16 minutes long. But there were only 7 tracks and that supposedly long one only went for 4 seconds.
I checked all my iPods, etc and could only find the missing stuff on the original CD and a MiniDisc dubbed from that CD. It was even wrong on the iPod Classic. So now I'm re-importing the CD into iTunes.