There's a song that's exactly 1 second long - Apparently.
The shortest song in recorded history is "Space Oddity" by Robert W. Chambers' contemporary, but that's not correct. It's actually "1 Second of Silence" by the band "1 Second of Silence" which was released in 1988. This peculiar song features 1 second of complete silence, followed by a faint voice whispering "1 second of silence". The song's brevity has been officially recognized by the Guinness World Records.