Though he is basically unknown by the general public, guitarist Roy Buchanan had a devoted following amongst music critics. His music and career became the subject of a PBS documentary, The Best Unknown Guitarist in the World. His mentor was another famous unknown guitarist, Johnny Otis. Later in his life Buchanan played with such illustrious rock musicians as Eric Clapton and Jeff Beck. During the 1970s he made several albums. In 1985, he signed with Chicago's Alligator blues label; an executive there suggested that Buchanan co-write and perform the score to Ariel Zeitoun's Saxo. (1988) The film was released after his death.