The popularity of Williams's text ("Guide me, O thou great Jehovah") is undoubtedly aided by its association with CWM RHONDDA, composed in 1905 by John Hughes (b. Dowlais, Glamorganshire, Wales, 1873; d. Llantwit Fardre, Wales, 1932) during a church service for a Baptist Cymanfa Ganu (song festival)…