Things that make me feel old, #179: Sigur Ros’ Agaetis Byrjun turning 10. To celebrate, the band has released the above performance of “Nyja Lagid,” which was originally filmed at the Icelandic Opera House for Icelandic TV in 1999. The footage from the album launch party has never been seen before, and the song was never released on any album.

Um, yes. Thank you Sigur Ros.