cwm

Cwm Rhondda, taken from the Welsh name for the Rhondda Valley, is a popular hymn tune written by John Hughes (1873–1932) in 1907.
It is usually used in English as a setting for William Williams' text Guide Me, O Thou Great Redeemer (or, in some traditions, Guide Me, O Thou Great Jehovah), originally Arglwydd, arwain trwy’r anialwch ("Lord, lead me through the wilderness") in Welsh. The tune and hymn are often called Bread of Heaven because of a repeated line in this English translation.
In Welsh the tune is most commonly used as a setting for a hymn by Ann Griffiths, Wele'n sefyll rhwng y myrtwydd ("Lo, between the myrtles standing,").

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