I would just like to say a few things about binaural beats. I will be biased and recommend hemi-sync. The reason I think they are a superior binaural beat is because they use a blend of tones. A lot of these binaural beats you find online will just bean you with a low theta frequency and say perfect for meditation. The reality is if you listen to a single tone of around 3.8 hz which borders delta then you will just fall asleep.

Hemi-sync conversely blends theta with a dash of alpha and a little beta. The idea is you go down to a theta state but you need the beta and alpha to keep you alert. Also the new SAM technology includes gamma frequencies which binaural beats can't recreate. Also a lot of the binaural beats out there don't bring you back properly so you are left ungrounded which is never good