I've never picked up on a theme for either Sirius or Pettigrew. Don't know what you're talking about there. Buckbeak's music never appears again after the initial scene of Harry flying on his back, therefore it's not a theme (a theme, by its very nature, is repeated). Double Trouble, A Window to the Past, and the Dementors are all themes, but Double Trouble appears in so many places in the score I couldn't tell you what it symbolizes. The other two are pretty clear. There's also a Patronus theme.

Neither Hedwig's Theme nor the Nimbus/Flying theme show up enough to really count. Now go back and look at the number of pieces of music on that score that are unique to a particular scene:

Aunt Marge's Waltz, The Knight Bus, Buckbeak's flight, The Whomping Willow/Snowball Fight, Quidditch Third Year (which bears no relation to the quidditch music in the first two movies), The Werewolf Scene, Saving Buckbeak, Forward to Time Past. The score is more heavily tilted toward the non-thematic elements.

> Um...there are many themes in PoA.

> 1. The Grim/Sirius Black Theme
> 2. Peter Pettigrew Theme(which also appeared very briefly in HBP as Harry
> and Slughorn walk to Hagrid's Hut - proof to me that Hooper has no idea
> what he's doing)
> 3. Double Trouble Theme
> 4. Buckbeak's Theme
> 5. Window to the Past/Harry's Family Theme
> 6. Dementor Theme
> 7. Hedwig's Theme, of course
> 8. Nimbus/Flying theme makes an appearance at the end