Yes - and this one is quite easy to learn.
Tryweryn is about the flooding of the valley in 1965 to provide a reservoir for Liverpool.
Today, there's a lot of canoeing and white water rafting on the river but back then, the story of the rehousing of 67 residents was front page news and a cause celebre.
Meic Stevens's song - quite an early one - is a simple folky item about how there are no flowers left in the gardens of Tryweryn while the fish swim peacefully above the houses.
Quite a surreal word picture of a real reality as "Cold water is sleeping in Tryweryn."