Allow grouping and subgrouping for artists in Artists View

[purplebee]

Hello,

The Album Covers view has the option to separate releases into groups and sub-groups in the main panel. The Artists view has a very similar layout, but only has the option to group artists by the first letter. My request is for the Artists view to work in a similar way to the Covers view, allowing you to use any tags to define groups and sub-groups of artists.

Here's a quick mock-up of a custom view that'd be possible with this feature. Subgroups could be used to further divide artists by state/city.