Although the site is perhaps of most interest to fans of 'classic rock', it also has much to offer those whose interests relate more to jazz, blues and other genres.
'Wolfgang' was the childhood nickname of concert promoter Bill Graham, who was born in Germany to a Jewish family in 1931. His mother died in Auschwitz, but Wolodia Grajonca, as he was originally named, was helped to escape from the orphanage he was in to a foster home in New York. Distressed at being called 'a Nazi', because of his German accent and foreign-sounding name, he decided to jettison both.
Entrepreneurially inclined and a sincere music lover, Graham found his vocation and made his fortune as a concert promoter in San Francisco in the 1960s. He was strongly associated with the Grateful Dead, Santana and other west coast bands, but staged concerts for all the major rock names of the era.
He liked to put artists from less exposed areas of music on the same bills as his famous headliners, which is one reason Miles Davis was able to connect with the rock audience that bought Bitches Brew.
Graham also helped introduce influential blues artists such as Muddy Waters and B.B. King to young audiences.
He liked to record his concerts, and the tapes were stored along with a huge collection of rock memorabilia in the basement of his office building. After his death in 1991, the collection changed hands several times, but was acquired in 2003 for US$5 million by another entrepreneur named Bill Sagan, who set about digitising the tapes and making them available for streaming from a site named in Graham's honour.