When we say goodbye and you go your way
I'll be standing by the same old doorway
I'll look up and see the same old moon
I'll hear the same old tune
And wish the whole world for you

I'll be waiting for you
Same old story
Mine will be the hope and yours the glory
When you're far away and I am missing you
I'll remember it's the same old me
The same old you.

Theme from Hope and Glory, slightly tweaked.
Slytherin Dungeon from the HP Lexicon.