He employed Sweets Edison, Herschel Evans, Lester Young, vocalist Jimmy Rushing, and guitarist Freddie Green in recording such hits as "Every Tub," "Shorty George," and his group's signature tune, "One O'Clock Jump."  
Due to a brief interruption where he worked with an octet, his periods with larger groups are dubbed the "Old Testament" and "New Testament."  Another departure from his major project led to a series of duets with Oscar Peterson. He employed Sweets Edison, Herschel Evans, Lester Young, vocalist Jimmy Rushing, and guitarist Freddie Green in recording such hits as "Every Tub," "Shorty George," and his group's signature tune, "One O'Clock Jump."  FTP, name this pianist and bandleader who received his name from a Kansas City DJ's proclamation that he was part of the "jazz aristocracy."
Due to a brief interruption where he worked with an octet, his periods with larger groups are dubbed the "Old Testament" and "New Testament."  
William "Count" Basie