Random songs added to music library

Every couple of weeks or so I notice new music added to my Apple Music library that I am certain I did not add. They are not downloaded, and they are songs that I haven’t played, sometimes from artists I haven’t heard of. I primarily use Apple Music on my iPhone (15), but I am also logged into via my iPad and it is attached to my smart tv. I don’t have a family account and the devices I am logged into are completely secure. Wondering why this is happening and how I can stop it.