Myfanwy (Welsh: [məˈvanʊɨ̯, məˈvanʊi̯], a woman's name derived from Welsh annwyl 'beloved'), is a popular Welsh song composed by Joseph Parry in four parts for male voices, and first published in 1875.^[1]

Sources differ as to whether Dr. Parry composed the music for an existing poem by Richard Davies ("Mynyddog Mwynfawr"; 1833–1877) (the common belief) or whether Davies wrote the words to Parry's melody following its use with an English lyric, entitled Arabella, by Thomas Walter Price (Cuhelyn; 1829 - 1869),^[2] journalist and poet.^[3]

Richard Davies' lyric may have been influenced by the 14th Century love story of Myfanwy Fychan of Castell Dinas Brân, Llangollen, and the poet Hywel ab Einion.^[4] That story was also the subject of the popular poem, "Myfanwy Fychan" (1858), by John Ceiriog Hughes (1832–87). Some sources say it was written with Parry's childhood sweetheart, Myfanwy Llywellyn, in mind.^[5] In 1947, Merthyr-Tydfil-born author Jack Jones wrote a book entitled Off to Philadelphia in the morning where he relates the story within some aspects of the life of Parry, weaving facts into his fictional narrative.^[6]

The ownership of the copyright was sold by Isaac Jones of Treherbert to D.J. Snell of Swansea in 1930, who reprinted it the following year.^[3] This version^[7] is shown above, with the following modernizations of the Welsh language:
digter to dicter, cynau to cynnau, ffol to ffôl, melus to melys, ol to ôl, chwareu to chwarau, thânau to thanau, auraidd to euraidd, ammod to amod, ddysglaer to ddisglair, ffarwel to ffarwél.

There has been a proliferation of word changes since 1931, with so many performers covering it. In particular, most modern versions substitute 'nghariad for cariad in Verse 1, cheisiaf fyth for fynaf byth and Ai gormod for A'i gormod in Verse 2, and 'ngeneth ddel for eneth ddel in Verse 3.^[8]

Here is the melody line from the 1931 publication.^[7]

As well as the song being sung in the original four parts by many choirs, the top melody line by itself has also become a solo love-song. A hundred years after it was first published Ryan Davies performed the song at the Swansea Top Rank introducing it as "the greatest love song ever written". A live recording of this version was included on Davies' album Ryan at the Rank and quickly became one of Davies' most notable and familiar performances.^[9]

Davies' rendition began a renewed popularity for the performance of the song, especially with Welsh Male Voice Choirs. Two of the most widely recognized choral renditions are by the Treorchy Male Voice Choir,and the Neath Male Voice Choir. The song is often performed at the Principality Stadium during the Welsh rugby team's home matches, and the Morriston Orpheus Choir recorded a version of the song for the Welsh Rugby Unions official album in 2006.

An English version was released by David Essex in 1987. John Cale has performed the song throughout his career, most notably a 1992 TV performance on the S4C programme Heno.^[10][11] Opera singer, Bryn Terfel recorded a choral version of the song on his album "We'll Keep a Welcome".^[12] Cerys Matthews recorded a guitar version for her 2010 album Tir,^[13]

The song features in John Ford's Academy Award-winning film How Green Was My Valley and also in the last scene of the Swansea-based movie Twin Town, where it is sung by members of many local choirs, including the Pontarddulais Male Choir. At a key moment of the plot, the protagonist in the 1992 Welsh-language film Hedd Wyn, which was nominated for an Academy Award, sings it to his former fiancée.

It is both played and discussed in the episode "Death and Dust" of the show Midsomer Murders, during a visit to Wales by detectives from an English village.

In the 2008 biographical romantic drama Edge of Love, Vera and Dylan Thomas played by Keira Knightley and Matthew Rhys respectively sing the song together to celebrate Vera’s recent marriage to William Killick played by Cillian Murphy.