You should be able to just paste the link. New forum does the embed codes automatically. (at least for youtube)
The High Chaparral theme you posted is exactly the same one I posted. Only the visual intro was edited slightly different. While I liked the Virginian and Gunsmoke I was never a fan of their theme songs. Heck, ':Have a Gun Will Travel' Ballad of Paladin was superior to those two IMO.
William Tell Overture will always be associated with The Lone Ranger Same for his descendant 'The Green Hornet" and "Flight of the Bumblebee" Batman (1966) Spider-Man