This passage is basically the first part of the creation myth that Tolkien designed for the world he wrote about. It tells about how Ilúvatar sang the Ainur into being and how the world and elements became real. The story mainly deals with Ilúvatar's vision and design of the world - through music.
"The Cottage of Lost Play" is the first chapter in The Book of Lost Tales part 1. It forms a framework narrative in which the other tales of the two books are told. The chapter features Eriol, a mariner, who finds himself on an island where he encounter elves who tell him tales of their history and the world .
The Book of Lost Tales is the first two books of the 12 volume collection of The History of Middle Earth. This is a compilation of material written by J.R.R. Tolkien put together by Christopher Tolkien.
I have started this blog in order to have a more engaging and active read through of Tolkien's The History of Middle Earth.