Growing up in a small town in Eastern Washington in the early 1970’s, I read a book I still remember. It’s a middle school targeted chapter book with a few line drawing illustrations. My copy was paperback. It features a father and son, the dad is a jazz musician / fan, I think they live in the Village - or at least someplace downtown NYC. Maybe there is some music that is played on the rooftop? Maybe parents are divorced? Published pre-1974.