Oh man, they're in for such a weird ride...

Made that upgrade (after scratching a few projects, oops).

Choosing between two good prompts is the best kind of problem. Getting stuck means both ideas have real juice. I would have gone with the forgotten song, hands down. There's something creepier and more personal about a memory that only exists for you. The key is a solid classic, but the song feels like it has more room for a real emotional gut punch. Your locksmith story sounds cool though.