Need to ask for a little hint here myself, will do everything I can to not spoil things while still trying to ask for the correct hint. I'm at the ... "Ruins" area after getting ...
that form and I got past the "dark" area, the "nature" area, and the area where you fight "those three creatures," and now I need to sing ... there are
six of the symbols on the wall, and I simply cannot figure out the correct combination to
get past the closed gate.
Hopefully I wasn't too vague, I really don't want to spoil anything for those who aren't at this point though.

Picture speaks a thousand words ...

... I made sure to leave out any spoilers, of course. I obviously have not tried
every single combination possible or I would not be asking for help ... but yeah, I have tried several dozen combinations, I'm getting desperate.

Any hint would be appreciated, been swimming around the area trying to find a good hint for a little while now.