Whose band was known as the Hot Five and developed a concept that revolutionized the?

The Hot Five was a jazz band led by trumpeter Louis Armstrong. The band recorded a series of influential records in the 1920s that revolutionized the concept of jazz improvisation. Armstrong's innovative playing style, which featured his use of "scat singing" and his use of high notes, broke away from the traditional New Orleans style of jazz and helped to establish the genre of modern jazz.