This may sound crazy, but it's true. We've been playing classical music in the lab at low levels for about four years as an acoustic cushion over the nosier instruments, computers, and engineers. Recently, we changed our listening to a Dubstep vibe: specifically the Dub Step Beyond channel from SomaFM. Guess what? A quantitative improvement in productivity; plus we are happy! If this works in your lab too, we suggest you donate to SomaFM, as we did for this great mindset.
This is a good sign!