taz633's advice worked for me.
Taz633's advice worked for me. Thank you!
After deleting the song from the music manager app on my desktop, I cleared the cache on the app on my iPhone, closed it and when I reopened it I clicked "refresh library". The artist was gone.
I did the same online too. I went to settings, then clicked Refresh Library. When I went back to My Library, the artist was gone.