That reminded me of a comment I heard during yesterday's round on the webcast. I think it was Rory from 80 yards hit it like 8 feet left and they were talking about how bad that was... It's like they don't even bother looking at or knowing the actual stats.
Wouldn't he need to take care not to create a scenario where it could be claimed he moved the ball? Also, as @Rulesman said he appears to be walking around someone's line (and possibly through line).
If I were asked to make the call I would say no penalty although I can understand why some think his delay was unreasonable.
If it's quiet enough that other groups aren't able to hear it unless they're really close, I don't have an issue with it, but it doesn't sound like that was the case for the OP.
Interestingly enough, if I heard someone blasting Journey in the middle of the fairway, I'd be totally fine with it.