Despite its primary emphasis on the blues and ragtime, the Samuel and Ann Charters Archives spans the entire 20th century, beginning with African-American spirituals and the ragtime of Scott Joplin and other early composers, and ending with Snoop Doggy Dogg and the rappers of the late 20th century. The Archives holds thousands of hours of recorded music on LP, 45 rpm and 78 rpm records, compact discs, audio cassettes, and reel-to-reel tapes. Though some records date back to the 1920s, the compact discs in the collection include both recent and reissued material. Most of these recordings are commercial, and the Archives holds a complete catalog of music produced by the Arhoolie label, courtesy of label owner, Chris Strachwitz and Document Records, courtesy of label managing director, Gary Atkinson. The artists included in the Charters Archives range from the most famous blues performers such as B.B. King and Robert Johnson, to obscure ragtime musicians. Many of the ragtime recordings are from concerts, conventions, and meetings hosted by the Maple Leaf Club.