Ardderchog. Grŵp talentog iawn. (What's interesting is that if you compare this with Cadi Gwen's original Nos Lawen recording 3 years earlier, they're perfectly synchronised from start to finish, without drifting by as much as a single beat. Must be the same editor too - they even cut to the drummer at exactly the same moments. I've clearly got too much time on my hands...)