Plans to hold a charity concert are put in peril by a ruthless property developer who wants to take over a restaurant. That's it really, the film sounds like it should be a crime drama with the title it had but instead you get a rather muddled musical drama with a little too much unfunny slapstick (which relies too much on "funny foreigners and their strange ways").
Real artists like Beniamino Gigli and Gino Bechi appear in the film, sometimes obviously dubbed. The lovely Zena Marshall is one of the film's few good points. To be honest you would probably be a lot better served watching the original 1948 film instead...