I have a feeling the creative muscle you've exercised as a musician has also helped tremendously as a hacker & business owner. Those same musician/programmers that I know also tend to come up with some pretty far-out ideas & solutions. The discipline of constant practice, the ability to tap into your "intuitive" & creative side, and the understanding of another language (musical notes) probably translates very well.

This can apply to other creative fields too, of course.