Steve Kline Ages of Rock
April 21, 1967
Working at Abbey Road studios in London, The Beatles complete the sessions for Sgt. Pepper’s Lonely Hearts Club Band. The final recordings are a short section of gibberish and noise to follow A Day in the Life in the run-out groove. They record assorted noises and voices, which engineer Geoff Emerick then cuts up and randomly re-assembles and edits backwards. At John Lennon’s suggestion, they also add a high-pitch 15-kilocycle whistle audible only to dogs. These are omitted from the U.S. version of the album.