Final answer:
The exact reaction of Harrison when musicians play in a manner that is cheap, silly, and false is not detailed. Based on context, he likely disapproves and might be motivated to elevate the artistic standard of music.
Step-by-step explanation:
When the musicians play in a manner that is cheap, silly, and false, Harrison's response is not explicitly stated in the information provided. However, based on the context and descriptions given, one can infer that the portrayal of the playing as cheap and false reflects a sentiment of artistic disapproval or disdain. What Harrison does as a reaction might involve distancing himself from such artistic expression or being motivated to seek or create a higher form of art that is true and valuable. The act of playing 'Home, Sweet Home' on a trombone could be seen as a trivialization of art, suggesting that Harrison may seek to elevate the standards of musical performance. The mention of someone watching a film with disharmonious music, and the anecdote of the veteran musician playing for a dance, evoke feelings of discomfort and disconnection from the music, further illustrating a general atmosphere where music might be taken for granted or not rendered with the respect it deserves.