Guide me, O Thou great Jehovah, Pilgrim through this barren land. Ydyw'r Un a'm cwyd i'r lan. Ydyw'r Un a'm cwyd i'r lan Fydd i'th enw byth am hyn. Fydd i'th enw byth am hyn.

It is one of the most instantly recognisable Welsh tunes, heard in chapels, at weddings and in rugby ... to Cwm Rhondda The petition said the church "has a special place in the history of Wales ...