best way to achieve this with minimserver

[antonmb]

You have several easy options I can think of if you're comfortable editing tags:
Use the Comment tag and add a descriptor for each owner. The Comment field can then be renamed as "Owner" and you can select each owner, then see all the usual sort fields for each.

Use the Grouping tag if you're not already using it.

Add a Genre for each owner and re-tag each owner's music with an additional genre.

Regardless of which way you go, I would separate each owner's music into subfolders under your main music folder. This will make it easier to do mass tag changes. Also it gives you one more alternative, you can access each via the Folders view.