Hey Velenoso, thanks for the message! I am guessing you sent that because of the image? If so, that shows a YouTube video yes, but sadly doesn't clarify if you can use YouTube Music Free with a Smart Display.
So in the Google Home app it says YouTube Music's Free service is available "when using a screen" (see pic)
So does a Google Home Smart Display (specifically Lenovo's) count as a display?
Thanks a ton!