Right, but there is also a lot of evidence (or at least it looked like there would be when I was in the field 5+ years ago), that it isn't that simple, and ther

Right, but there is also a lot of evidence (or at least it looked like there would be when I was in the field 5+ years ago), that it isn't that simple, and there is also considerable ipsilateral motor control in the cortex as well. This would make sense for activities that require coordination between both hands, so that, in the motor cortex, we wouldn't have the case where "the right hand doesn't know what the left hand is doing." So, if there is MORE coordination required than in a typical cortex, maybe non-coordinated tasks become clumsier? I have no idea. Maybe musical people tend to spend less time doing non-musical athletic things, and aren't as graceful? Maybe both, or something else? Sounds like a cool imaging project for a neuroscience or BME grad student.