Ac-Cent-Tchu-Ate the Positive or Accentuate the Positive is a song written by Harold Arlen and Johnny Mercer. It was recorded by Bing Crosby with John Scott Trotter and his orchestra and is heard on Diamond City Radio in Fallout 4. Although Bing Crosby's most famous rendition was a duet with the Andrews Sisters in 1944, it is not the one used. The song in-game is 1 minute and 8 seconds, particularly short for a commercial recording. It comes from a 1945 radio broadcast of the Kraft Music Hall.