In a sense the Harry Potter music grows up in parallel with Harry and his audience. The music becomes "more current" as the series progresses (i.e. evolving into a style more prevalent today) as distinct from "more modern" since John Williams' music is arguably more modern musically (i.e. more complex harmonically and orchestrally). Nevertheless like the films themselves, the complete set of 8 soundtracks provides a perfectly satisfying listening experience and one that rewards repeated listening.
Here are links to the piano sheet music books of the individual films, plus again some notable individual pieces and collections of Harry Potter sheet music.
On the right you'll find Harry Potter sheet music arranged for piano. We also have Harry Potter sheet music arranged for including trumpet, clarinet, flute and others at our .
While reading , Nick Lang and a few others attending the discussed the possibility of Draco Malfoy having a crush on Hermione Granger because of him constantly bullying her, and created the concept of a song "Granger Danger," which led to the idea of making a Harry Potter musical. When the script was being written, they asked if they could use his songs "Sami," which was originally written for the , and "Not Alone," which they ended up using as a model for the show.