When putting videos in YouTube tags, you don't want to put the entire URL in there. Instead, you just put the video code.
YouTube URLs use this format:
http://www.youtube.com/watch?v=sk-9ihcy2R8
The watch?v= is a YouTube redirector indicating which video is being watched (hence the format), and everything after that is the code for the individual video (which is why those codes get so weird and random). So everything after the = is what you would want to put inside the youtube tags. Or it will just give anyone who clicks the videos an error, the way yours was.
Also, the track Wicked Flight (middle one of the three you put up) has sections with an overture that sounds to me like a faster, rock version of the Great Fairy theme from Legend of Zelda: