I've tried them out many times, and haven't noticed any difference. I admit, at times, I find some of them to sound annoying. I haven't ruled them out yet, however, because I know other people have used them successfully. I did listen to some kind of native drum beats on a loop, a few times, and one of the first times I listened, I had what was either a very vivid dream, or a 5-second astral projection in which I flew out of my house and almost immediately into a tree, then I woke up. If you can get them for free, it's definitely worth a shot.
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