If you watch Starman (http://asianwiki.com/Starman), I’m sure you know this song ^_^
Artist: Ohashi Trio (大橋トリオ)
This song was originally sung by David Bowie, released in April 1972 on The Rise and Fall of Ziggy Stardust and the Spiders from Mars album.
(Note: the video is not mine. Credits goes to Avexnetwork)