Plenty of debate on the web as to the background/origin of Surpreme Leader Snoke.
A few of the distinguished theories I have come across:
Darth Plagueis (the master of Darth Sidious/Palpatine).
Darth Vader reincarnated
Luke Skywalker’s alter ego
The little boy within the Jedi temple who speaks to Anakin moments before the purge
Jar Jar Binks
Grand Moff Tarkin
Snoke’s theme is much like the theme ‘Palpatine’s Teachings’ from Revenge of the Sith, when Palpatine tells Anakin about Darth Plagueis. It would not be the first time that there have been musical clues in Star Wars. The celebration theme from the tip of Phantom Menace has a choir section that feels like a faster model of the Emperor’s theme from Return of the Jedi.