月の踊り子 (Tsuki no Odoriko)

Tsuki No Odoriko is a song sung by Miku Hatsune. Rin Kagamine has her own version of this song as well. Miku's version is a Niconico only song. Rin's version is the two-hundred-and-eleventh track in Other Vocaloid Songs 59: Making A Comeback Volume 7.