In my script I build a dictionary of keys(albums) mapped to artists(values) so that I can do a quick lookup of what artists made what albums. However, I want the user to be able to find all albums which contain a substring. For example a search on "Light" should return 

`[Light Chasers] = Cloud Cult` and also `[Night Light] = Au Revoir Simone`

What's the best way to do this? Should I even be using a dictionary?