The longest recorded song is over 24 hours long - Apparently.
The piece, titled "Longplayer," is a computer-generated composition that was started in 2000 and is still ongoing. The song is designed to run indefinitely, with its algorithm generating new music based on a set of rules and patterns. As of 2022, it has been playing continuously for over 22 years, making it not only the longest recorded song but also a unique example of ambient music that challenges traditional notions of what a "song" is. The project is maintained by the Longplayer Foundation in London.