The longest recorded song is over 1,000 hours long - Apparently.
The song "Longplayer" is a computer-generated piece of music that was started in 2000 and is still ongoing. It is designed to play continuously for 639 years, with a 24-hour loop of music that slowly changes and evolves over time. The song's composition is based on a mathematical algorithm that generates new music every 24 hours, making it a constantly changing and unique piece of music.