It's not free, but I listen to brain.fm while writing code at work: https://www.brain.fm/app https://www.brain.fm/app I have found my ability to focus is incre

It's not free, but I listen to brain.fm while writing code at work: https://www.brain.fm/app https://www.brain.fm/app I have found my ability to focus is increased when listening to their "Focus" music.