Nif

My understanding of how to cleanup all songs in your Canola2 database.

1) Go to Settings Menu (Click on the Settings Icon in main menu)
2) Media Library
3) Audio Folders
4) Uncheck ALL folders (click in the eye to remove the check mark)
5) Back to main menu (you will see the "Updating Database" message)
6) Back to settings and re-check the Audio Folders
7) Back to main menu.
8) Done

Hopefully this will resolve issues you have with multiple copies of a album where/when different artist have contributed to tracks on the album etc.
It seems to have worked for me and I am now happy with Maemo4 of Canola2 Beta 5 and my album art based views