I consider myself musical although I've never really mastered a musical instrument despite lessons in piano (as a child), once owning and fooling around with a guitar (as a young mother), and taking some voice lessons a few years ago.  I'm certainly musical by association in the sense that my spouse plays piano well, even professionally sometimes, and so I'm around music a lot.  His partner comes over and they rehearse stuff, just for fun and so they will be ready for the next gig that comes up.  And I like to sing, too, despite a rather narrow range.  Now I've decided to learn the electric bass so I can accompany him and his partner. 

What does this have to do with yoga?  More than meets the eye.  For one thing, the way I use my yoga practice is to teach myself to be present for everything that comes along and accept it as it is.  Moment to moment presence, even with limited success, is both humbling and exhilarating.  Learning more challenging yoga postures can fulfill me in this way, and I find some of that presence in learning to play a new instrument: it's the now, and very powerful for that reason (as Eckhardt Tolle wrote).  I find that it's impossible to be distracted while making music, and getting better at it will probably only enhance that focus.   You're reading notes, you're attempting to produce melody and rhythm, you have to pay attention to the way you use your hands, how you hold the instrument, the posture you assume in relationship to the instrument;  everything happens at once.  After enough practice, this all becomes second nature.  Not unlike the fluidity with which more adept yogis can flow into several variations of surya namaskar without having to think.  In either case, you are connecting to a pattern or rhythm embedded in the universe, just waiting to be  discovered ... by you.  That makes it worthwhile, in and of itself.