Nemo is a French prog rock band active since 1999. They have released 6 studio albums thus far, all recommended and with each one getting tighter, better and more ambitious in their scope.
Here's the opening song from their third album, Prélude À La Ruine, from 2004.
Here's the second song from that album, an instrumental piece
Listen to more here and also listen to their Jukebox here: http://nemo.web.free.fr/NemoJukebox.html