that diagram may be a little off ratio-wise but i think that’s generally the deal with that overall correspondence. a couple points appear in considering this. [and of course it seems like if someone is really into music they kind of are from birth, and if they aren’t they just aren’t.] one point is that i think if a person was interested in music, it would be good to fall in love with it. i guess i’m speaking to the fan impetus, which comes before the desire to play an instrument, in my experience.