The National have given new meaning to the idea of "one really long song." The indie rockers endeavored to play the tune 'Sorrow,' which appears on their 2010 release 'High Violet,' for six hours straight last night (May 5) as part of MoMA's PS1 Sunday Sessions. This was their encore.

And what an encore it was. To call it unforgettable would be an understatement. It also tested the boundaries and limits of one's patience, but only the strong survive!

They played the song a total of 105 times over the course of 360 minutes. That's a lot of 'Sorrow' for one performance, but if you're a diehard fan of the band, and that's your favorite track, well, then eureka.

Videos of the performance are available in bite-size increments several minutes long. Even the band needed a break from the track, as drummer Bryan Devendorf took a pass for one of the song's turns. As can be seen in a clip shot four hours into the show, Devendorf "folded," so to speak, making for a drum-free version that takes place at the 7:26 minute mark. How's that for changing it up a bit?

Pitchfork reports that the band delivered the version true-to-form. Over and over and over again.

Watch the National Six Hours Into 'Sorrow' Set

Watch the National Four Hours Into 'Sorrow Set' Sans Drums at One Point

Watch More of the National's Performance of 'Sorrow'