Although Casablanca was billed as a romantic melodrama it also contains a merry-go-round of popular songs. As most of the action takes place in a nightclub this is acceptable, but the pop songs are not just pleasant background jingle—they are employed as an integral force to move the story along. The true lovers (Bogart and Bergman) have their motif in “As Time Goes By”; even the crafty Police chief has his song--“Love for Sale”. And of course there’s the memorable battle of the songs when the Nazis’ rendition of “The Watch on the Rhine” is drowned out by the would-be Free French rival chorus of “La Marseillaise”. There’s a roll call of classic pop song skittering through the film ranging from the ragtime era to up-to-date hot and sleek songs such as ”You Must Have Been A Beautiful Baby", by Harry Warren and Johnny Mercer. Truly the movie is Hollywood genre product at its finest—grand romantic melodrama wrapped in relevant song!