Ollie Johnston[?], who joined Disney in 1935, first working on Snow White. Went on to author the animator's bible The Illusion of Life with Frank Thomas.
Frank Thomas[?] joined Disney in 1934. Went on to author the animator's bible The Illusion of Life with Ollie Johnston.
Wolfgang "Woolie" Reitherman[?] joined Disney in 1935, as an animator and director. Directed all the Disney films after Walt's death until his retirement.
... where each of the band members improvised individually, while still blending together as a cohesive musical unit, often engaging in extended improvisationa ...