I'll be surprised if this video link stays up for very long here as Roland's Tango is copyrighted. Secondly I wonder if this instructor and his sponsor GSI a guitar seller have permission from Roland Dyens' estate (he passed away a few years ago) to publish a tutorial video without any royalties coming in - I mean they're driving people to their site which sells expensive guitars, that's the goal. Seems to me the Dyens' estate should get a cut of profits.
Yes, we did acquire mechanical licenses and digital distribution licenses for the performance preview of the piece, even though the performance preview is free of charge and not used for monetization purposes. There is nothing proprietary about breaking down the piece in the form of a tutorial though and, as such, there is no specific license required for that. With regards to the sheet music, we have provided a link to an authorized distributor that sells Tango En Skai.
We are happy that folks are benefiting from these resources and that daunting pieces loose their intimidation factor when broken down in smaller chunks.
Life is too short to play music you don't really like!