Meet the Mobsters.

Down-and-out lounge singer Johnny Slade is hired by a mystery man to open a hot new club, the catch being he's given a new--and terrible--song to sing each night. Noticing that whenever he sings one a new crime is committed, Johnny gradually realizes his songwriter-benefactor is a powerful mob boss in hiding and his "Greatest Hits" are the only way the man can give orders to his crew...