Question: Annette Bryn Parri is a Welsh pianist, best known as an accompanist to opera stars such as which Welsh bass-baritone opera and concert singer?

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Sarah Edith Wynne: Sarah Edith Wynne (Eos Cymru) (11 March 1842 – 24 January 1897) was a Welsh operatic soprano and concert singer.  She was born in Holywell, Flintshire, and studied singing with Scarisbrick in Liverpool and Pinsuti at the Royal Academy of Music, where she was Westmorland Scholar from 1863 to 1864.  She subsequently studied with Romani and Vannuccini in Florence.  Her first appearances were in provincial concert halls and theatres.  She made her London debut on 4 July 1862 at St. James's Hall in John Thomas's Welsh concert.  Wynne sang in the United States with the Janet and John Patey and Charles Santley in 1871-1872, and at the Boston Festival of 1874.  She also appeared in opera at The Crystal Palace between 1869 and 1871 as Arline in Wallace's "Maritana" and as Lady Edith in Randegger's "Rival Beauties", but she was chiefly noted for her singing of art song and ballads.  She married an Armenian barrister, Aviet Agabeg, in 1875 and after her marriage increasingly devoted herself to teaching oratorio and ballad singing.  She died on 24 January 1897, and was buried in Hampstead Cemetery.

Robert Hale (bass-baritone): Robert Hale (born August 22, 1933 in Kerrville, Texas) is an American bass-baritone opera singer.  Although born in Texas, Hale spent his childhood in Louisiana.  When his family moved to Oklahoma City, he attended high school and college (Southern Nazarene University graduating in 1955 {at age 16?})  there and completed his master's degree at the University of Oklahoma.  While still at the University of Oklahoma, he won the National Association of Teachers of Singing "Singer of the Year" award and completed further studies at Boston University and the New England Conservatory of Music where he was awarded the Artist Diploma as well as winning the Metropolitan Opera National Council Auditions.  He began his career as a recitalist appearing in concert halls across the United States and later made his operatic debut at New York City Opera, as Colline in "La bohème" (1967).

Thomas L. Thomas: Thomas Llyfnwy Thomas (23 February 1911 - 17 April 1983) was a Welsh American baritone concert singer who achieved fame for his performances both in concert halls and on television and radio, most notably on "The Voice of Firestone", where he was the most frequently featured singer.  His concert repertoire included lieder, opera arias, ballads, spirituals and songs from musical theatre and operetta.

Bryn Terfel: Sir Bryn Terfel Jones, {'1': ", '2': ", '3': ", '4': "} (] ; born 9 November 1965) is a Welsh bass-baritone opera and concert singer.  Terfel was initially associated with the roles of Mozart, particularly Figaro and Don Giovanni, but has subsequently shifted his attention to heavier roles, especially those by Wagner.

Frederick Hobbs (singer): Frederick Henry Hobbs (29 July 1874 – 11 April 1942) was a New Zealand-born singer, actor and theatre manager.  After performing as a concert singer in New Zealand and Australia and in opera and musicals in Britain, he joined the D'Oyly Carte Opera Company in 1914.  There he played the baritone and bass-baritone roles of the Gilbert and Sullivan operas for six years.  After touring in Australasia with the J. C. Williamson company, he returned to England and became the stage manager for D'Oyly Carte in 1923 and its business manager from 1927 until his death.

Eduard Tumagian: Eduard Tumagian (born 1944) is a Romanian bass-baritone opera and concert singer.

Annette Bryn Parri: Annette Bryn Parri is a Welsh pianist, best known as an accompanist to opera stars such as Bryn Terfel, Rebecca Evans and Jason Howard.  Parri appears regularly on the National Eisteddfod stage, and also at the International Eisteddfod at Llangollen.

Richard Watson (singer): Richard Charles Watson (1903 – 2 August 1968) was an Australian bass opera and concert singer and actor.  He is probably best remembered as a principal with the D'Oyly Carte Opera Company who sang the comic bass-baritone roles of the Savoy Operas, but he appeared in a wide range of operas at the Royal Opera House and with the Carl Rosa Opera Company with singers including Lotte Lehmann and Lauritz Melchior, under conductors including Sir Thomas Beecham and Bruno Walter.

Carmen: Duets &amp; Arias: Carmen: Duets & Arias is an album released in 2010 by Italian tenor, Andrea Bocelli.  The album is a collection of arias of Georges Bizet's opera "Carmen", including duets with Welsh bass-baritone, Bryn Terfel, Russian mezzo-soprano Marina Domashenko, and Italian soprano Eva Mei, from the French opéra comique.

Ian Wallace (singer): Ian Bryce Wallace OBE (10 July 191912 October 2009) was an English bass-baritone opera and concert singer, actor and broadcaster of Scottish extraction.

Supporting paragraphs: Annette Bryn Parri Bryn Terfel
Answer: Sir Bryn Terfel Jones