SkyTown is the theme for the area of the same name in Metroid Prime 3: Corruption. It is an orchestration with "vocals" singing in the background. It can be purchased from the Soundtrack Gallery, and is not heard in Eastern SkyTown (Heion1 is heard instead). On the UK Corruption website, it is known as Track_3 in the music player. It is one of two background themes in the Special Mission, with the other being MP3 Title Music.
It can be heard here: .