The words are by John Newton, an English sailor and slave-ship captain who became a clergyman in the Church of England. He wrote the hymn to go with his sermon for New Year's Day 1773 at Olney, in Buckinghamshire, where he was curate, and it was published in 1779 in Olney Hymns, a collection he made with the poet William Cowper.
The words were sung to several tunes before William Walker joined them, in his shape-note tunebook Southern Harmony of 1835, to the melody now inseparable from them: New Britain, an anonymous American tune. It has since become one of the best-known hymns in the English-speaking world.
This transcription: The hymn tune New Britain, as sung today to John Newton's words; melody in G major, left hand by GOONS Studio.
Transcribed by GOONS Studio from the original work, which is in the public domain.
On guitar: Amazing Grace guitar chords and lyrics, with a guitar that strums along.