Why wouldn't you say "berühren" here?
Because it doesn't make sense with what comes directly before. At least not with my understanding of "simple changes" and I can't think of any other meaning for "simple changes" here. That's why I asked what you thought it meant.
Look at the the context given:
"You have to bring the feeling and expression to it. What can you emote with these simple changes? That’s what always got me."
If the sentences were: There's so much feeling and expression in the blues. That's what always got me.
...then Pipper's interpretation would make sense. But the context given is different.
"Emote" is also an interesting choice of words BTW. He frames it as a question, but it's a rhetorical one.
He could just as well have answered:
Look at the incredible wealth of emotions that can be expressed by these simple technical means. That's what always got me.
@#11: ...and referring to chord progressions which grab you / touch you.
I don't see that anywhere.