My point of interest was the fascinating activity of some mythological creatures and fascination as such. In different cultures these qualities are manifested by Mermaids, Rusalkas, Sirens, as well as heavenly birds in slavic myths (Gamayun, Sirin and Alkonost). The thing that unites them all is that they make sounds that are amazingly beautiful, and those who hear these sounds forget everything they know and want nothing more ever again. Some of them live in the in the underworld, some - near heaven; they are connected to thunderstorms and making sea rough and untravelable. Their beautiful songs were foretelling or even creating the future.
You can also here a version with "double exposure" - all of that plus rainy but magical, psychedelic and radiant London as prevailing background for all the things playing in my mind.