If Youtube videos do not play reload the page, that's a Youtube bug.
Or maybe now, a few years later, it's a new bug ;-)

Suie Paparude - Soundcheck

Cœur de pirate - Francis

Cœur de pirate - Place de la République et Adieu (Wood & Wires Session)

Crystal Fighters - Champion Sound

Karsay Dorottya - Nem tetszik a rendszer