James P. Johnson is an innovative jazz pianist who created a unique ragtime and stride piano music style during the 1920s and 1930s. His distinctive sound, combining technical virtuosity with jazz expression, created an original style that influenced many musicians. He is known for experimenting with different pianistic techniques, creating a sound that sets him apart from other artists. His influence on the music industry left a significant mark, inspiring other artists to expand boundaries and explore new creative possibilities in jazz piano.