Listen to J. Hughes: Cwm Rhondda / Guide Me, O Thou Great Jehovah online. J. Hughes: Cwm Rhondda / Guide Me, O Thou Great Jehovah is a Welsh language song and is sung by Bryn Terfel, Welsh National Opera Orchestra, Gareth Jones, The Black Mountain Choir and The Risca Choir. J. Hughes: Cwm Rhondda / Guide Me, O Thou Great Jehovah, from the album A Song in my Heart, was released in the year 2007. The duration of the song is 3:39. Download Welsh songs online from JioSaavn.