How to figure out whether a kid really wants to learn an instrument and put in the necessary work is one of the great mysteries of the universe.
She is in 7th grade now and has been playing violin since kindergarten. She has been playing piano for about 5 years, I suppose. It's not like she wants to quit either piano or violin, she just wants to do clarinet, too. She is an amazingly gifted violinist but while my wife and I think she is lazy with respect to practice (and homework), that is probably par for the course for kids. Hate to be too hard on her. Her mother's brother and a cousin on her mother's side are gifted in the same way. One of them has taught himself about half a dozen instruments, at least. So, with music, while I hate to feel that it's "different", I am much more willing to subsidize clarinet than ski club or the skateboard she recently asked for.