Looking for a fic….. again

I really hate ding this but I need the help, this time Glee.

Firstly all those that will complain this is not a proper fic, I completely agree. I honestly swore I would NEVER do this but I'm desperate. I have been searching for this story for weeks and only through sheer exasperation do I write this and I'll probably (definitely) delete this when I get an answer (if ever).

Facts about fic

It's a Glee fic

It set when Kurt is at Dalton.

It involves the Warblers hearing Kurt sing defying gravity, and he actually sings it no video

Anyone got a clue?