Found on the original cast recording of Bells Are Ringing, this is one of the loveliest ballads ever written for a Broadway musical.  The fact that Judy Holliday and Sydney Chaplin had to strain a bit to hit their notes only adds to the poignancy of their performances.  Unaccountably, and to me disastrously, the song was left out of the movie version of the show.

Above, Holliday and Chaplin with director Jerome Robbins during rehearsals.