I got the Vienna Singer about two weeks ago when I was helping a friend get the Black Spindle. It is a rare drop.
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FYI - I ran this solo the other day, failed the mission, noticed a buddy in my clan was also running the mission jumped in on his solo attempt, :39 seconds later, I shot a few blights, DarkDrinkered a few Taken acolytes and Vienna Singers dropped for myself and my clan mate, Klatzy, much appreciation there