The song is a mysterious song, Nintendo is playing with Wii Music. While the game has seen quite a introduction in theory via video previews first introducing the Wii, we now finally get our grubby hands on the first tidbits of Wii Music. For starters players will be able to enjoy playing the best music from both new and classic oldies created by Nintendo's sound team.

Wii Music will be structured around Play Sessions which will allow up to six players to participate in the jam at once, four controlled by the players and two optional controlled by the computer. Players will have the option to the conductor baton and over 40 instruments
"Players will have access to the conductor baton and over 40 instruments, such as the Folk Guitar, Bass Guitar, Trumpet, Xylophone and Maracas. Different instruments will feature different controls. The trumpet will make stronger sounds when the Wii Remote is held at a high angle and weaker sounds at a low angle; the drums can be played using two Wii Remotes; a button can be used as a "pick" when playing the guitar to elicit both single sounds and full chords, and so forth."
While there is no official confirmation on the release date for Wii Music, a tentative release is set sometime in 2008.