“It Might As Well Be Spring” is a Richard Rodgers/Oscar Hammerstein classic from the 1945 film State Fair, winning the Academy Award for Best Original Song that year. Jeanne Crain performed it in the movie, but the voice was dubbed by Louanne Hogan.
Dick Haymes had the first hit with the tune in 1945, and later, in 1961, Frank Sinatra hit with it on his 1961 album Sinatra & Strings. Other early recordings include The Sammy Kaye Orchestra with Margaret Whiting on vocals (1945), Sarah Vaughan (1955), Ella Fitzgerald (1961), Shirley Bassey (1962). I’ve always been partial to anything Stan Getz did with it.
Here’s a great version by Nina Simone from an album called The Amazing Nina Simone (1959).