challenge: According to AllMusic reviewer Thom Jurek, what is notable about the album 'Blues and the Soulful Truth' in relation to the artist's overall work?
  
  A. It is a compilation of his greatest hits
  B. It is his least popular album
  C. It is a singular achievement, showcasing the artist's abilities in a wide range of African American musical traditions
  D. It is his most experimental album
  Answer: 