I don't listen to music while working, because of studies showing that, e.g., programmers listening to music are equally competent at implementing a given algorithm, but much less likely to notice that the algorithm's output is always equal to its input.

This is absolutely true. I'm a little shocked at how many programmers and other 'mind-workers' (students are especially bad at this) think that putting on some music is helpful, or neutral. It's neither; even classical music or chants hurt.

(I have no studies handy for this, but I've tried music with Mnemosyne, Gbrainy, and Dual N-back, and in all 3 and all the sessions, my statistical performance was hurt to a greater or less extent.)