Doc Cook (1891-1958), born Charles L. Cooke, was an American jazz bandleader.
While many early jazz musicians used such titles denoting advanced degrees, Doc actually held a Ph.D, from the Chicago College of Music.
In the player below, "Sidewalk Blues" (1926) featuring the great New Orleans
cornet player Freddie Keppard.
The group broke up after having all their instruments stolen from the bandstand during a break at a marathon dance contest.