As someone who used to play the violin, this drew me in.
Very much enjoyed it.
Playing is indeed an odd experience. On one hand, a violinist, or any other player, has to dedicate mastering his instrument, so it's very much a solo eandeavor.
OTOH, you're part of a group, and if the obo or trombone or whatever section is off, even just ONE person, than the harmony is off.
So in that way, it is a lot like life. It's both individual and collective, and when everything goes right, it is indeed harmonious.
One small nit pick. Even though I like the tercets, you may not need the very first line since it's also the title of the poem (kinda repeats).