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Suo Gân (pronounced [sɨɔ ɡɑːn]) is a traditional Welsh lullaby written by an anonymous composer. The song's title simply means lullaby. It was first recorded in print around 1800 and the lyrics were notably captured by the Welsh folklorist Robert Bryan (1858–1920).
Bryan was born at Llanarmon-yn-Iâl, Denbighshire, Wales, son of Edward and Elinor Bryan . He was a pupil and a pupil teacher at the Wrexham British School and then educated at the Normal College, Bangor, the University College of Wales, Aberystwyth, and at Oxford. He was forced to discontinue his studies at Oxford in 1893 without attaining a degree because of ill health. He lived at Wrexham and Marchwiel until 1903 when he moved to Caernarvon, where his brothers, Edward and Joseph Davies Bryan had a house. His brothers ran a successful retail business in Egypt with large stores in Cairo and Alexandria, and branches in Port Said and Khartoum. Robert Bryan spent most of his winters there, returning to Caernarvon each summer. He died in Cairo, Egypt, on 5 May 1920, and was buried there.
The song has been recorded numerous times and used in films scores including Empire of the Sun. The Vienna Boys' Choir features Suo Gân (entitled "Suo-Gan") on the 2003 The Christmas Album. It is on The Irish Tenors album Home for Christmas. The rock band Savatage used the song as a base for their song "Heal My Soul" on the 1991 album Streets: A Rock Opera.