Q: My music library - error 'cannot open. media format no supported'

Hi dmoses2014,

Thanks for using the Apple Support Communities!

I understand that you are experiencing an issue with music playback on music you purchased from iTunes on your iPad. We know that issues with purchases can be frustrating, but we are here to help.

To begin troubleshooting, I would suggest deleting that music and downloading it fresh from the Purchased section in Music. 

On an iPad

1. Open the iTunes Store app.
2. Tap Purchased. 
3. Tap Not on This iPad. 
4. Scroll to find the song that you want to download, then tap it. 
5. Tap the Download icon  to the right of the title. Your song downloads to your device.

Download your past purchases - Apple Support

If you continue to have an issue after downloading these songs again fresh, I suggest using the information in the next article to report this issue to iTunes support. 

Report a problem with an item purchased from the iTunes Store, App Store, Mac App Store, or iBooks Store - Apple Support

Best!