Why did Herman callaway have one white man in the band in Bud Not Buddy?

In "Bud, Not Buddy," Herman Calloway includes one white man, Mr. Jimmy, in his band to reflect the complex social dynamics of the time. This inclusion highlights the intersection of racial boundaries in music, showcasing how jazz brought people together despite societal segregation. Additionally, it emphasizes Calloway's progressive attitude and the importance of talent over race in fostering a sense of community through music.