Q: Can you delete from iCloud music library?

I record a weekly show on a local radio station and recently logged onto their Mac with my account. What has happened now is that their 45,000 songs are now added to my iCloud music library and every time I update my library it tries to download all their songs to my devices.

Can I access my iCloud music library and delete those songs off it to stop this from happening. I delete them from my Macbook and it asks to delete them from all devices, but when the library updates again the whole process repeats!

It's quite annoying - any advice?