This is a song parody I wrote about Sir Cadogan. It goes to the tune of "Oh Holy Night". 

Oh painted knight, with armor brightly shining!
He always strove to be noble and brave.
On Halloween, when the Fat Lady fled
and Gryffindor felt terror and dread,
he became the guardian of the tower,
to keep Sirius out regardless of the hour.

Sir Cadogan, so chivalrous and loyal,
Oh knight divine, he tried to save the day.
Oh knight divine, oh knight, oh knight divine!

Sirius came with all the passwords written.
He easily passed Sir Cadogan’s watch.
The knight was disgraced and returned to his tower, 
on the seventh floor near the divination room.
Left with only his horse by his side,
he remained chivalrous although could not ride.

He still dreamed of adventure and glory.
Oh knight divine, oh knight so honorable.
Oh knight divine, oh knight, oh knight divine.

Ninja Nettle