Hi, all. For some reason this song has always struck me as a father's words of advice to their child who has gotten into the entertainment industry (maybe even Issy). It could be someone dreaming of getting into the music business, but it also works well for other forms of entertainment where there is a performer. He is telling them to ignore the noise and people that aren't paying attention to the stage and to keep hanging on to their dream of being an entertainer, because one day everyone will pay attention to their performance - every heart will belong to them.
This seems like it is set in either a bar or a casino, where you have entertainment and a bar-type situation.
Well, that's my take on it.