It came to be known as Day's signature song. The three verses of the song progress through the life of the narrator-from childhood, through young adulthood and falling in love, to parenthood-and each asks 'What will I be?' or 'What lies ahead?' The chorus repeats the answer: 'What will be, will be.'ĭay's recording of the song for Columbia Records made it to number two on the Billboard Top 100 chart and number one in the UK Singles Chart. Doris Day introduced it in the Alfred Hitchcock film The Man Who Knew Too Much (1956), singing it as a cue to their onscreen kidnapped son. ' Que Sera, Sera (Whatever Will Be, Will Be)' is a song written by the team of Jay Livingston and Ray Evans that was first published in 1955. ' Que Sera Sera (Whatever Will Be, Will Be)' Doris Day performing the song in the 1956 film The Man Who Knew Too Much.