Now that the orchestra attribute is going away (thankfully) we should store this data where it belongs: on the artists. I would like to add a few new artist types to more clearly store this kind of info.

As a minimum, I'd like the top level here - ideally, I'd want them all:

Orchestra
-Chamber orchestra
-Symphony orchestra
Choir
-Male choir
-Female choir
-Mixed choir
-Children choir
Chamber ensemble
-String quartet
-Piano trio