music vanished 1 week after purchased and unable to redownload

If you purchased music or albums you can get them back

re- Download apps, music, movies

https://support.apple.com/en-ca/HT201272

Or ....

Go to Settings > [your name] > iTunes & App Store.

Tap  your Apple ID at the top and sign out 

Close Settings.

Go back to Settings and sign back in 

Go to the iTunes Store to find the music, tap the cloud icon to download 

You’re welcome

Glad it worked!