Mmmmm, firstly I wonder what is the point in all these children being forced to learn the piano and violin and it really is a cliche. How many of them actually use it in later life?
That's not to say that learning an instrument is not beneficial as DS2 studies 4 including his voice. I doubt he'll ever be a professional musician but he loves music, for now. In saying all that I am the type of mother that makes sure my child studies an instrument for a minimum of six months before they decide to give it up. Once they have commited (not necessarily by six months) and get their own instrument it is on the understanding that they then learn the instrument for the duration of prep school so around four/five years. I don't care if they get to grade 1 or grade 8 on it but I am not spending hundreds or, in DS2's case, thousands of pounds on an instrument for my child to give it up because they are bored with it.