Llef (in English "A Cry") is a popular Welsh hymn, written by David Charles (1803-1880) (son of David Charles (1762–1834)). The tune was composed in 1890 by Griffith Hugh Jones (Welsh language name Gutyn Arfon) (1849–1919) and was written in memory of his brother Dewi.
The meter is 8-8-8-8, and it is played in the keys of D minor and E minor. English texts also commonly sung to the tune include "Bow Down Thine Ear, O Lord, and Hear",... meer