What music would suit a heroic knight?

rainbow valley by love affair

rainbow valley by love affair.

Belle Delphine - Hit or Miss

OK ,the obvious answer: "The Impossible Dream".

Knights Of Cydonia by Muse.

Viva la Vida by coldplay

Expire works by Wagner.  Tons of great things would work for you.

and there was much rejoicing
https://www.youtube.com/watch?v=jYFefppqEtE

Power metal all the way.  Hell, that's power metal's favourite subject.  If you can find a power metal song that doesn't include the words "galloping", "victory" or some mention of a bladed weapon, you're not listening to power metal!

Fanfare for the Common Man -- Aaron Copland
https://www.youtube.com/watch?v=4NjssV8UuVA

William Tell Overture -- Gioachino Rossini
https://www.youtube.com/watch?v=c7O91GDWGPU

W O L F C L U B - Never Stop
https://www.youtube.com/watch?v=iWy7LfIQlzA