This is the theme song for the anime series "Ghost in the Shell: Stand Alone Complex."
The vocals are incredible. Singer Origa's voice works beautifully with that of boy soprano Ben Del Maestro. The lyrics are in Russian (Origa's of Russian birth) and English, but until I started writing this post, I never really paid attention to the words. It's one of those songs where I just float along, not even wanting to breathe.
Kanno's music works well under the vocals, giving support while staying properly in the background.
Wikipedia entry for Yoko Kanno.
The full song is here, on YouTube.
The lyrics are at AnimeLyrics.com.