countbasie "One O'Clock Jump" bandleader Jazz great (1904-1984) One O'Clock Jump composer Legendary bandleader Bandleader of the Barons of Rhythm Bandleader known for 55-Down "Jumpin' at the Woodside" composer/bandleader Musician with the 1939 hit "Jumpin' at the Woodside" "One O'Clock Jump" composer Bandleader known for 55-D