"  Isn't It Romantic ?"   A most cherished song by Rodgers & Hart.  It starts with a preliminary ' verse' that sets the subject and mood that is to follow in the main chorus or refrain. Lorenz Hart wrote so poignantly about love and romance  which eluded him throughout his life. His song "Nobody's heart belongs to me" is a sad description 
  of his lifelong disappointments.
The song scholar, Michael Feinstein, has an encyclopedic grasp of the Great American Songbook canon as demonstrated by his inclusion of a verse. Many versions do not use the intro and that is a shame.

 https://youtu.be/L-HjX9By0js