Hola Gibson,
All your dance video need new links! They do not work, You need the "share" link NOT the "Embed link" as this has been disabled by the owner.
click to play one your self you will see!
for instance the link you need for "HIGH SCHOOL DANCE BATTLE - GEEKS VS JOCKS!" (above) is:
RE: HIGH SCHOOL DANCE BATTLE - MASCOT SHOWDOWN