SpeedMaster for Youtube alternatives

Do not recommend. The Crown didn't operate as implied on the website. There is an image on the home page of their website which shows a User's graph when they have been tracking their brain waves while working for over 2 hours, however it's not possible to do this with the app and device that I have. The supplied app (with prioprietary music) only works for 5 minutes at a time and you're meant to stop what you're doing, close your eyes and focus on the music while it's playing ie. you cannot use it continuously while you work. The manufacturers suggest you can you link it with a Spotify premium account but this is just playing publically available music and I can see no way to monitor what my brain waves are doing during those sessions.