The screenplay was rewritten from the book for Sigmund Romberg 's 1917 operetta Maytime by Rida Johnson Young only one musical number by Romberg was retained .
Rida Johnson Young is romberg 's librettist ; however .
The screenplay was rewritten from the book for Sigmund Romberg 's 1917 operetta Maytime by Rida Johnson Young , Romberg 's librettist ; however , only one musical number by Romberg was retained .