Improvised prelude on hymn tune CWM RHONDDA organ (Guide Me O Thou Great Jehovah)

Gathering music before worship service: improvising on hymn tune CWM RHONDDA, written by John Hughes (1907). This tune commonly associated with the hymn text Guide Me O Thou Great Jehovah. ….Incidentally, with the church bell ringing, there, at the end, it matches pretty well with the music, so I’m discovering the bell rings a “D”. Sounds like D3.