The question How to deal with boss constantly talking to colleagues, which affect my concentration? was closed as duplicate of the question What can I do about a very loud coworker?. However, the OP pointed out in his edit that the situation is different because it involves a boss.
However, there is already another question Boss plays loud music affecting my concentration. How do I take this up with him? which covers that situation, and looks to be a better duplicate than the currently linked one. Of course, when I saw the question in the Reopen queue, I linked the "better" question in a comment.1 However, linking the question directly as a duplicate would make it more visible and more accessible.
How do we deal with this? Should I flag this post to moderators for a quick fix? Should I cast a reopen vote to (eventually) close it again with the "better" duplicate?
1 Interestingly, before my comment, the OP had commented that he already resolved the issue by following the approach suggested in the accepted answer to the "better" duplicate question.