For 10 points, name this tenor saxophonist who was nicknamed "Prez."  
George Russell's book The Lydian Chromatic Concept of Tonal Organization used this musician's solos as an example of horizontal improvisation. In a recording released under "Jones-Smith Incorporated," this musician performed a frequently-imitated solo during the standard "Oh, Lady Be Good." In the title of a head arrangement based on the chord progression of "I Got Rhythm," this man "Leaps In." This musician called the bridges of songs "George Washingtons," coined the term "bread," meaning money, and came up with many other slang terms that popularized the original (*) hipster ethos. He also nicknamed Billie Holliday "Lady Day," and replaced Coleman Hawkins in Fletcher Henderson's orchestra after himself leaving Count Basie's band. His death in 1959 inspired Charles Mingus's elegy "Goodbye Pork Pie Hat." For 10 points, name this tenor saxophonist who was nicknamed "Prez."  
George Russell's book The Lydian Chromatic Concept of Tonal Organization used this musician's solos as an example of horizontal improvisation.
Lester Young [or Lester Willis Young; accept Prez before mentioned; accept President before mentioned]