This seems to work great. I appreciate it Andrei.

There is one small problem that isn't urgent. After using the collaboration feature, the cds with collaboration get alphabetised separately from those without. Here's just one example:

Chet Baker and Lee Konitz, In Concert.

In Concert appears under Chet Baker as the last item in the list of cds (this is in view by artist) and not in the middle of the list where it should be.

I know, all this work and the customers still complain.