Listen to What a Diff'rence a Day Made (Happy Session) online. What a Diff'rence a Day Made (Happy Session) is an English language song and is sung by Benny Goodman. What a Diff'rence a Day Made (Happy Session), from the album Three Classic Albums Plus (Benny Goodman in Moscow Record One / Benny Goodman in Moscow Record Two / Happy Session) [Remastered], was released in the year 2013. The duration of the song is 3:33. Download English songs online from JioSaavn.