I saw someone using ear muffs once, and I thought it was a good idea. I like brainwave entrainment (maybe lower the volume, and use passive noise cancelling hea

I saw someone using ear muffs once, and I thought it was a good idea. I like brainwave entrainment (maybe lower the volume, and use passive noise cancelling headphones), as it entrains the brain to the appropriate frequency to help maintain focus, relaxation, creativity, or whatever else you're pushing for. Then again, the only frequency that's "safe" to be listened to long term is 10Hz, and entraining to the other ones take less than 1 hour.