Second Music of the Ainur

The first Music of the Ainur was the Great Song sung before the beginning of time, that created a vision of the World and, through the power of Ilúvatar, the World itself. It is foretold that there will be a Second Music at the end of time, though it is uncertain what the purpose of the Second Music will be: apparently either to bring the existing World to an end, or to create a new one. According to the prophecy, the Ainur will be joined in the Second Music by the spirits of Men, but it seems that the Elves will have some other part to play.