The reason so many claim that they’re not “musical” probably dates back to their elementary music class.
We never were just handed the mic or a drumstick with the opportunity to jam.
We were handed a 100 page book on reading sheet music, it confused us, and now we claim we have no music capability.
We were taught that music is very proper. We were taught it is mathematical.
Our Intro to Music 101 was a semester about rules.
The same goes for most business school classes.
Ashton.Gustafson 
Sheet music is only one part of music. Music can be appreciated, read and expressed on many levels; hearing, graphic notation, improvisation, imitation, chords…
Sometimes we are given to much text and minimal opportunities to do and experience!
And the same goes for success. It’s one thing on paper – it’s another thing in motion.