It's a nice idea. We'll discuss it here and add it to our development list as a possible feature for a future version of Mezzmo.
(Although it does not satisfy your needs of knowing who streamed what, there is the play count for each file in the current version of Mezzmo and that tells you whether a file has been played or not. Go to Details view to see the play count and last played date. Or, right-click on a file and click Properties to see/reset the play count)
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