(; ) is a Christian religious radio programme of congregational hymn-singing, produced in the Welsh language by BBC Radio Cymru. Traditionally broadcast on a Sunday afternoon with R. Alun Evans presenting the hymns, it comprises recorded excerpts from (plural of , ) from across Wales. Largely amateur singers sing in four-voice harmony on this programme.
The programme was first broadcast on the BBC Home Service on 15 February 1942, it is the longest running Welsh-language broadcast.
In its archive it has a recording of every hymn in the Welsh hymn book .