A number of studies have shown that music can increase productivity. Starting with a study done when I was a young boy suggesting that listening to Classical music could boost your intelligence for about 15 minutes, a useful thing to exploit before a test.
However, in some people, this has no effect. So how can I use this effect to best results?
I think the best solution, as most offices already do most of their works on computers, to offer headphones and a collection of productivity-enhancing music. This way, those that like music will benefit from it, but it won't disturb or bother those that gain no benefit.