This is so wrong. My SO is a composer and sits up to 16 hours a day in front of the piano doing his thing. It is a lifelong addiction - but is it really bad you think?
Not everyone is capable of working eight hours a day then walking home 1 hour, grocery shopping 1 hour, cooking and housework 1 hour, TV 2 hours and then go to bed and sleep. If we were all like that we would still not have invented the wheel - or your doc's stetoscope, for instance...