There is no official format for Music/Song articles except a brief overview/description of how the music/song is produced (Hoodwind, piano, Gregorian Chant, etc). In addition, in-game scenes where the music/song is played should be included.
Also, a YouTube video should be added to the article if available and a Music Template should be included at the end of the article. If a YouTube video is added, it should be in such code:
<youtube width="200" height="25">YOUTUBE SPECIAL EMBED CODE</youtube>.
Note: a Song is defined as metrical composition intended or adapted for singing, especially one in rhymed stanzas; a lyric; a ballad where as a Music is defined as pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics, and the sonic qualities of timbre and texture.
With that said, a Song is when a lyric is present (Example: Breaking Benjamin's Blow Me Away used in Halo 2) whereas a Music is when only the melody is heard (Example: Chopin's "Preludes #15, Raindrop" used in Believe campaign).