Canu Rhydd, Welsh for "free poetry", is described in the sleeve notes as “that written by the free will of the poet, unconstrained by patronage or by the bardic tradition”. The album, like all Fernhill albums features songs sung in both Welsh and English. Different traditional songs are woven together in each track, changing the thrust of the original songs within their new context. They are, according to Julian May in a Songlines review of the album, "concerned not with the culture of past aristocratic patronage but the expression of the ordinary people of Wales. So they have lovingly assembled these songs from odd verses and fragments of manuscripts. They are about love, place, birds, forests and everyday life. They are touching and beautiful." It is the first Fernhill album to be released on the disgyfrith label. All their previous albums were released on Tim Healey's Beautiful Jo Records, based in Oxford, England.