While the film scores points with its music details, The Piper isn't more than just a generic horror film.
I've always appreciated a film that has a specific focus on something that's supposed to be a crucial part of the story. In this case, Piper does so with its music. The particular haunting composition at the center of it has an especially haunting and unnerving air to it. Unfortunately the rest of the soundtrack doesn't have that same quality to it. We're given a film where the main focus is actually its only strong point..... Those who know the story of the Pied Piper of Hamelin will at least appreciate that there's a mild nod to it, but it's such a mild part of the movie, replaced instead by a clunky subplot involving a big orchestral performance and some family struggle moments. There was potential for growth, but it was ultimately squandered by the generic and safe approach taken with telling the main story. Plus, a lack of actual character personality makes most of the movie proceed at a sluggish pace.
There's a heavy reliance on jumpscares that just doesn't translate well to the finished product, especially where there were opportunities for visual flair or a stylish means of incorporating the music more heavily into it. Those familiar with the usual tired techniques of cursed things films will find plenty of that here, as well as other bits of yawn-worthy cliche and gimmickry. While there were a few bits of intriguing cinematography, it isn't often enough to warrant proper recommendation..... Acting was also subpar, with Julian Sands being criminally underutilized in his role as conductor Gustafson. There isn't enough visible skill in the performances for anything noteworthy.
The Piper is yet another forgettable film. It's not worth watching, especially with how little it makes use of the music at the center of it.