What was Mr. Holland trying to get Stadler to appreciate about music by taking him to Lou Russ' funeral?

In "Mr. Holland's Opus," Mr. Holland is a music teacher who feels very strongly about the power of music in the world. He decides to take a teaching job because it would give him more time to work on his own music. However, he ends up staying when he realizes the difference he can make in the lives of his students. One of these students is Stadler, who is very good at memorizing facts, but struggles with being able to "feel" the power of music. Mr. Holland decides to take him to the funeral of Lou Russ, who died in Vietnam. The purpose of this is to show Stadler how powerful music can be, and how it can make you feel deep and complex feelings, including that of grief.

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.