Citations: 

Tolkien, J. R. R. The Book of Lost Tales, Part I. Ed. Christopher Tolkien. The History of Middle-earth: Vol. 1. George Allen and Unwin, London, 1983.

Tolkien Gateway entry for “The Music of the Ainur” 

https://tolkiengateway.net/wiki/The_Music_of_the_Ainur

 (Accessed April 27, 2024)