iTunes Music on PC syncs to Ipod mini but not to iPad

I have 1,200+ songs on my PC version of iTunes, most of which were loaded from music CDs over the years. Some are purchased from Apple. I've been syncing to my iPod mini for years without problems.

Recently, I connected my iPad by cable to the PC and synced up for the first time. The full library came through, but I got a small list of errors for songs that are "not authorized." I deselected those and ran sync again, but instead of a slightly reduced set of songs, the iPad showed 2,400 songs, half of which were duplicate titles.

Worse yet, it turned out that nearly all of my songs had not actually downloaded but were empty except for the title. When I tried to play them, an error box displayed, saying the song was "not authorized for my region/country," or some such. There did not appear to be any easy way to correct the situation, so I deleted the Music app on the iPad and downloaded a new copy.

The new app copy did not make things better; it's just a new flavor of bad. The region/country warning is gone, probably because the sync process only syncs items purchased from Apple. The other 95% are absent. I cannot find a workaround.

iTunes and OS versions on both devices are current. I have iCloud available on both devices, but it's unclear if it can be used to help.

I've tried converting some test cases on the PC side to .mp3's etc., but it makes no difference.

I'd really like to solve this.