Yes. You can batch change the value in the Grouping field. For what is worth the original intended use for this field appears to be to link say two or three tracks together within an album such that those tracks always play together and in sequence if you use the Shuffle By Grouping option, e.g. to link the movements of a classical work. Quite what happens when all tracks from the same album have the same value isn't clear. I assumed it might shuffle albums, playing the whole of each album in sequence, but I'm not sure that is the case. In practice I use this field to hold keywords or tags for my tracks. It is particularly useful as it can be displayed in the column browser.
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