Why are music files mysteriously downloading from Apple Music, filling up my iPad storage?

Can someone explain what triggers the downloading of music files to my iPad mini? I have been enjoying the *Apple Music Classical* app daily, and occasionally the *Apple Music* app. I want to remember albums, performers, and composers. But I do not have enough storage to download the music. Unfortunately, my iPad is mysteriously filling its storage with downloaded music files. I have not tried to download any of them, I just want to stream only. But the downloads just keep coming. I have been deleting the music files individually in the Settings app > Apps > Music > Downloaded Music. But they keep on reappearing. It has become a near daily battle of deleting one file after another tediously, just to keep my iPad mini operational. I have turned off “Automatic Downloads.” I have been marking many things as “favorite” so that I might find them again later. But according to the manual and the AIs this should not trigger downloading.