I already have a separate landing page for my music. Can I hide my ArtistPage?

Yes, you can hide your ArtistPage from public view! This option is available in the general settings of the ArtistPage editor - you can navigate there from the homepage, or from your Promote tab.

Once in the editor screen, scroll to the toggle marked 'Hide page from the public'. Toggling this will hide your page immediately; no need to save.