This passage of the tale told by Lindo is a continuation from the previous chapter “The Theft of Melko and the Darkening of Valinor”. It features how a group of the Eldar, notoriously a lot of the Noldoli, leaves Valinor and wanders north in order to access the world, that is, the Great Lands (or Middle-Earth as we know the continent as in Tolkien’s later works).
The tale of this chapter concerns how Melko manipulated the Noldoli in order to get hold of the the precious gems that they had made and to create distrust towards the other gods. The chapter also features the theft of the Silmarils and the ruin of the Trees of Light.
The first part of the chapter "The Music of the Ainur" consists of a text which picks up from where the "Cottage of Lost Play" ended. It mainly describes a meeting between Eriol and aged Rúmil who dwells at the cottage and cares for the garden. This part forms a link between the "Cottage of Lost Play" and the tale of "The Music of the Ainur".