The Day the Music Died (Merlin Fanfic)

Merlin expected Arthur's return at some point but the others? After years of waiting and watching over the world, Merlin sees his dollop head king once again as well as the Knights, Gwen, and Morgana . Only they doesn't remember a thing. And If things couldn't get more unexpected, Marlin was young again. The only one with memory of magic and Camelot, he connects with the people he once knew and does his best to stay strong. Merlin is now on tech crew with Gwen for Arthur and the knight's hit band. His mission, of course, is still to protect Arthur. But does he make them remember or let them live happily?
Disclaimer: I do not own Merlin that goes to BBC and the title is a reference idk if I need a disclaimer for it but here's one)