Sigur Ros.
it means "Victory Rose" in Icelandic.
sometimes they sing in Icelandic, sometimes in Hopelandic, their made up language. they make amazzzzing music.
(but of course timtimtimtim already knows this)
their albums are Von (Hope), Ágætis byrjun (An Alright Start), ( ) (all in hopelandic, and all untitled), Takk...(Thanks), Hvarf-Heim (Haven-Home), and, most recently, Með suð í eyrum við spilum endalaust (With a buzz in our ears we play endlessly).
best part? they have free downloads of a LOT of their songs on their site for English speakers:
http://www.sigur-ros.co.uk/media/
do it. it's free. no, seriously.