Maybe not music and not flat white noise, but some generators like at https://mynoise.net/? I find that many of them help me concentrate, or get more energetic/more relaxed. Though the advice to test different things is a sound one (no pun intended). Music with lyrics in the same language as the one you are working in (say, while writing some texts) can actually make it harder to concentrate, but music with lyrics in a language different from the one you are currently using might help you focus... Different things work for different people, though. "Field" video game music also good? It is designed to help you focus, after all, to be "in the zone".