[Cyberspy]

Reading about this study and the experiences described in other comments, it seems the experiment is a bit limited in its scope.

The effect of music depends on the person, the type of music (lyrics or instrumental - even if there is applause or not), how well the person knows the music and, of course, the task itself and its complexity.

Until there's a way to test all of those permutations, I think the best we are going to do is rely on all our anecdotal evidence, as it affects ourselves.