Add the modifier "Limit Database To | All"
[File Type]=[mp3] ~d=a ~sort=[Album Artist (auto)],[Album],[Disc #],[Track #],[Name]
EDIT: You might need to untick the "Use parent scheme rules..." option before this will work. If that causes other issues, you'll need to amend the rules for this view to compensate. Also note that if you have any mp3 files on optical discs and MC has a record of them in the CD/DVD database, then these will also be included in the list by the "All Databases" modifier. Consider some [Volume Name] rules to exclude those if that applies to you.
Also consider adding the "Stack Icon" column to your file list as this will help identify those file in stacks and those not.
Clicking on the stack icon for a given file expands that stack. If the other stack members are not mp3 files, it will appear as though nothing has happened, but the stack will have been expanded. Click the icon again to collapse.
From this view, you can access and work on the files without worry, but always remember that as far as MC is concerned, the stack is collapsed.
This little snippet, if you want it, will limit the file list to only include files that are in stacks: -[stack top]=-1
regards,
-marko.