Questions about the literary meaning or significance of the lyrics of a song or the literary devices used in them. Should be used with either the song-writer or the band in lieu of the author tag.
Existing policy is not to create tags for individual short works. The issue of whether or not we need tags for any individual works has been debated several times. The result of the latest meta discussion was in favour of using such tags, but the voting was fairly divided and we didn't get a very strong majority; however, what we've actually been doing in practice on the site for a long time has been to create tags for individual long works such as novels, plays, series, etc.