Here is a list of a few songs that would work in both of these and Half-Blood Prince
- https://youtu.be/adrDiJmzchE?t=3m22s
- https://youtu.be/-1YVP3BRtXE?t=2m6s
- https://youtu.be/Xpo5Ztlywfg?t=32m17s
- https://youtu.be/Xpo5Ztlywfg?t=35m8s
- https://www.youtube.com/watch?v=WgoyCH9XSlc (only first 30 seconds)
- https://www.youtube.com/watch?v=3MvHMPKg6oE
- https://www.youtube.com/watch?v=ySvXYETgOws
- https://www.youtube.com/watch?v=cQ38d5903BY&t=14s
- https://www.youtube.com/watch?v=i_3YzZvXJtQ
- https://www.youtube.com/watch?v=lfHAvyMcGOk
- https://youtu.be/vcW49__-Pag?t=13m10s
Thank you for those suggestions. Some of them, maybe to your surprise, are already even in use. The original score of SS-CoS has a stamp on both OotP and HBP.