Ágætis byrjun
"Viðrar vel til loftárása" (Icelandic for "it's good weather for airstrikes"; pronounced ) is a song written and recorded by Icelandic post-rock band Sigur Rós for their second studio album "Ágætis byrjun". The song appears as the seventh track on the album. It was also released as the B-side of Sigur Rós' debut single "Svefn-g-englar".