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 ;-)

Mandragora - Fake Acid

Mandragora - Codeine (Live In Porto Alegre, Brazil)

Mandragora - Sem Você, Sou Ninguém

Mandragora - Mira

Mandragora & La P'tite Fumée - You See Me