At the piano is the song's composer, Hoagy Carmichael. The lyric is by Johnny Mercer born yesterday 101 years ago. Oh, the gent in the naval cap is Humphrey Bogart. The movie is To Have and Have Not script based on Hemingway's novel of that name, not his best alas but you can't have everything. I believe Bacall improvised the famous lines, Yoiu know to whistle, don't you, Steve? You just put your lips tiogether and blow. — DL