I don't know if songs are accepted or not. But this is my entry for the contest.
On the Twelfth day of Halo my Reclaimer gave to me,
Twelve Crawlers crawling,
Eleven Energy Swords a-glowing,
Ten DMRs,
Nine Needlers,
Eight Watchers watching,
Seven Spike Grenades,
Six Snipers sniping,
Five Holy Rings,
Four Hunters hunting,
Three Gauss-hogs,
Two Thruster Packs,
And a Pistol from Halo CE!
On the Twelfth day of Halo my Reclaimer gave to me,
Twelve Crawlers crawling,
Eleven Energy Swords a-glowing,
Ten DMRs,
Nine Needlers,
Eight Watchers watching,
Seven Spike Grenades,
Six Snipers sniping,
Five Holy Rings,
Four Hunters hunting,
Three Gauss-hogs,
Two Thruster Packs,
And a Pistol from Halo CE!