A Hungarian squire and his son compete for the favour of an operetta diva; the younger makes the running. - Unplausible mistakes, small intrigues and a lot of love in an old-fashioned musical comedy with proven comedians.

Gusti Aigner and Franz Lenhardt are in love, but composer Lenhardt is too shy and bashful to go out and sell his compositions to music publishers. Gusti takes the burden on herself; and while there are complications and humorous situations she runs into.

The young musician and composer Josef lives with Beethoven's music copyist in Grinzing. In the evenings, he plays for dances in the Prater, often his own melodies, although he doesn't make much effort to spread them, as they're almost all waltzes, a dance not well-regarded in high society because they're too sweaty. When one evening a lively princess—fresh from the convent—mingles incognito with the Prater crowd and falls in love with the dashing conductor Josef, an entire cultural system of values ​​begins to crumble.