I received an email announcing that Music Vault was now a channel on YouTube.
You may remember a service called Wolfgang's Vault:
"In 2003, Wolfgang’s Vault acquired master recordings from the archives of
Bill Graham Presents. These live concerts were recorded at legendary
venues like the Fillmore East and Winterland between 1965 and 1999.
Since then we’ve acquired over a dozen more collections - some large, some
small, all of them compelling, spanning a wide spectrum of musical genres."
That collection of collections became Concert Vault, a paid subscription service.
Wolgang's Vault still exists as the merchandise outlet - shirts, artwork etc.
Music Vault looks to be a lot of Concert Vault's video library ... for free! Enjoy!