users' artists are now independent of eachother. Added array of users to Artist schema. When a user presses 'add artist', the database is searched for the existing artist, and if it is found, it is added to the user's artist array. (The artist db will need to be pre-populated.) This way, there are not new artists being created whenever a user would like to add one. 'Artists you are tracking' is populated from the Artist's array of users. This will need to be changed to load from the user's array of artists.