I think there are so many ways to become interested in music. I believe signs of sustained interest gives a sense of the right time. Music if thought of as a language would perhaps indicate that as early as possible is not so bad. I do believe that a really nurturing first teacher that makes the child love something is crucial.
A lot of my friends are gangsters. Not like gangsters - well yeah all sorts of levels of criminality - but not the types that are preying on innocent people. I have no interest in the type of criminality that has no respect for collateral damage.