Focus Music

Amazon Alexa Music has been pushing what they call 'Focus Time Music'   With claims for 'perfect sound when you are studying, working, reading or writing '.   They just suggested the idea to me.  Something I have tried myself for years, with playlists, particular artists, etc.    For me its jazz.   Does it really work?  More than other methods.   Seems you could do some controlled  experiements,anyone know of any?  How about taking that to creativity?   Here is what they write about it.