custom tagnavi to show singles

[spanktastic2120]

I probably have hundreds of artists in my music library with just a single song by them, it is the overwhelming majority of my library. I'm looking for a way to group all of these artists together and just display their songs with a custom tagnavi, but i have no idea how to implement this. I have read through the documentation on it and looked at some examples but i have no idea how i could sort artists whom i have a single song by into a special group.

what i have envisioned is something like this
>Singles
     >track 1
     >track 2
     >.....
>Artist 1
>Artist 2
>....

i would be really grateful for any advice.