The treasure trove of concert recordings within Wolfgang’s Vault are being made available for sale through a deal with Universal Music.
Vault contains recordings made at Bill Graham-promoted concerts, King Biscuit Flower Hour shows and other catalogs.
Concerts longer than 30 minutes run $9.98; less than a half-hour run  $5.98; and  one- or two-song performances cost $3.98. Almost 500 concerts are currently for sale.
Website will continue to offer free streaming of shows and most recently added an hourlong 1970 concert by Van Morrison, an '87 Oakland concert by Robert Cray and a Joan Armatrading show from 1977.