public bool IsInstanceOrChildren(Genre genre)
 {
     return(genre == this || ChildGenres.Any(it => it.IsInstanceOrChildren(genre)));
 }
 public void AddParent(Genre genre)
 {
     this.ParentGenres.Add(genre);
 }
 public Artist(string name, Genre genre)
 {
     this.Name  = name;
     this.Genre = genre;
 }