What song is he longest?

The longest song I have ever heard of is a song that is supposed to last for 1000 years. But that is just a machine making the song.

The longest song is recorded by Bull of Heaven and it lasted 6 years. I'm not sure what it is called though.

Another very long song is Metropolis by Dream Theater. It is divided into two parts. Part one is a 9 minute and 32 second song. Part two is 77 minutes and 6 seconds long. This is the longest song that I know of, but part one is on a different album.