I have been listening to focus noises for the last few days while working, and I have never been as productive as I am now. I have been able to write blog posts while avoiding my email and other distractions.
The focus noise I have been listening to is similar to the noise a helicopter makes (but not as loud). This has led to a dramatic increase in productivity. There are focus noise options on YouTube such as rushing water (I have tried working while listening to this noise and experienced similar results of productivity).
The problem with music on the radio is that there is not a constant sound. There is no way to get the tunnel vision we need in order to be productive by listening to different songs on the radio. With these focus noises, you hear the same sound which always gets repeated. Working with this sound will allow you to get the tunnel vision you need in order to increase your productive. When you turn off the radio, you will feel some kind of difference because the sound will be off. However, when you turn off a focused noise, the tunnel vision gets snapped, and the difference is greater.
Focus noises are an underrated way to getting a lot more done.