[mod]

On linux, at least:

play -q -c 2 -n synth brownnoise band -n 1600 1500 tremolo .1 30

That's nice for drowning out noises when I need to. In case you can't test it out, it sounds a lot like sitting by the beach with waves rolling in. Lyric-less (or nearly) music also works well for me, I just have a playlist on spotify.

[cag_ii]

That's great, thanks for that recommendation!

By modifying the last parm I get a more pronounced wave in/out sound that works well for me:

   play -q -c 2 -n synth brownnoise band -n 1600 1500 tremolo .1 75

[partisan]

Thanks for this. I will be trying it for a few hours tomorrow morning.

[lighttower]

wow. I think this beats my brain.fm recommendation. Doesn't need a browser / internet to run. Thank you very much.