Longest Song

Though not an individual song, actually several instrumental tracks added together, this is totally badass.

YouTube - Dream Theater - Stream of Instrumentals

The longest song that I have heard is the Live Version of Freebird. My parents went to their concert back in the day, and then when they ordered the CD from BMG Music, they played that song every day. I would ask Dad, "Is the song almost over? I have homework." After months of listening to that song, they would play the song just to annoy me. Don't get me wrong, they were great parents, they just did things like that to bug us. I bugged them too. Like one time I bought a universal remote without telling them, and then I would turn the TV off. Dad was so peeved. Anyway, getting back to topic...

Freebird.

Can't find the long version of it on youtube, (Which makes me question it's exsistance) but supposedly Rocky Mountain Jam was played for about 31 minutes. I think that would be the lonest that comes to my mind.

Still for me, Blinded By the Light is the longest feeling song...It just goes on and on and on.....

Mine is probably Atom Heart Mother by Pink Floyd at 23:42. One thing I've noticed about super long songs is that you can't really get tired of them easily if they're done right. I've listened to Yes' Close To The Edge many times, and it never gets old. For the record, it's 18:30.

Achilles Agony and Ecstasy in eight parts by Manowar. longest song I have and I listen to it every day. Best 28 minutes and 38 seconds of my day, usually. Hail and Kill.

Dopesmoker By Sleep Just a little over an hour 63:31

Not one song, a mix of several songs
But armin van burren's mixes he puts out every year. I think the longest one I have is just a little under 2 hours. Great stuff to listen to on long drives.