So clever! I enjoyed the different forms Harry chased Snape through, and how very plowing-ahead-doggedly-in-the-face-of-danger-and-disdain true to character Harry was. Also the dialogue, with Snape being so snarky and snarly and Harry just trying to get a word in edgewise.
Hermione and Ron were lovely as well, and I always enjoy seeing the Trio still together after the war.
I do sort of fret over the implications of Harry 'living' in a music box with a dead man, but that's probably putting too much seriousness on a light-hearted story. Nicely done.