Ha ha ha
In our case DS9 is brilliant at piano with math being his weakest area!
He didn't have a burning desire to start piano a year ago, but I thought it would be good for him based on the whole "math = music" idea. I also think that I started him on piano based on his intelligence rather than a natural talent. Now he composes his own simple songs and like Kimck's DS, pieces together theme music...Star Wars is a favorite! I don't think it's a passion for him, and it comes easily, but he will sit at the piano and plunk out a song he heard someone else play until he has it mastered.
His verbal skills are much stronger than math, but he also has perfect pitch and timing, which helps. I think it's different for every child.
