Recently I found a nice place that might be useful for you all. I Dose has a collection of free sounds that improve concentration. As they say, those sounds can help to relax your stressed brain or make it more alert and improve the concentration level. It simply sounds to improve concentration. The bright side is that you don’t have to buy it because I Dose provides the free streaming sound.

What should I do to try this out?
1. Sit or lay down in a comfortable place.
2. Wear your headphones.
3. Choose your desired state from the following list.
4. Close your eyes, and enjoy the sound