On WP7, double albums (with two discs) all appeared under the same album, and were properly sorted by disc.

On WP8 they aren't sorted by disc but like: D2-1, D1-1, D2-2, D1-2...D2-n, D1-n.

I tried moving them to different folders, but this creates different folders in the music app as well.

Is there a way to get them all under one folder and properly sorted by disc?

The tags are correct as far as album name and track & disc numbers.

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