PBS
Pbs Kids Go: Chuck Vanderchuck "Something Something" Explosion!
Interactive site that teaches kids about jazz, jazz instruments, and writing jazz music. Includes games,videos, and lots of great sounds.
Smithsonian Institution
National Museum of American History: Smithsonian Jazz: Duke's Music Class
Learn about jazz from the master, Duke Ellington. Three activities explore his role as jazz composer, orchestra leader, and pianist.
Black Past
Black Past: Mingus, Charles
In this encyclopedia entry, you learn about Charles Mingus, jazz bassist and composer.