Why is chapter 17 of Bud Not Buddy so important?

It is amazing to me that chapter 17 can be described as important.  It isan important chapter, but it always shocks me how important it can be with how very little stuff actually happens in the chapter.  The story starts off with Bud cleaning tables and mopping floors.  He turns it into a sort of game in order for the work to not be monotonous.  The members slowly file in and begin to play...

It is amazing to me that chapter 17 can be described as important.  It is an important chapter, but it always shocks me how important it can be with how very little stuff actually happens in the chapter.  The story starts off with Bud cleaning tables and mopping floors.  He turns it into a sort of game in order for the work to not be monotonous.  The members slowly file in and begin to play their instruments in an informal jam session.  They are all impressed with Bud's hard work, and Bud is equally impressed by their playing.  That's it.  That's the entire chapter. 

But lack of action doesn't mean a text can't be pivotal.  Chapter 17 is important because it marks a change in attitudes for Bud and Herman. Until chapter 17, Bud has never really experienced music before.  He's so mesmerized by it that he can't find the words to express himself.  The chapter is important because it transforms many of Bud's preconceived notions about music and Herman. Additionally, the chapter transforms how the band views Bud.