Mefistofele is an opera in a prologue, four acts and an epilogue, the only completed opera by the Italian composer-librettist Arrigo Boito.

Boito began consideration of an opera on the Faustian theme after completing his studies at the Milan Conservatory in 1861. Mefistofele is one of many pieces of classical music based on the Faust legend, and like many other composers, Boito used Goethe's version as his starting point. He was an admirer of Richard Wagner, and like him chose to write his own libretto, something which was virtually unheard of in Italian opera up to that time.

The most popular earlier work based on the legend was Gounod's opera Faust, which Boito regarded as a superficial and frivolous treatment of a profound subject. Furthermore, Boito was contemptuous of what he saw as the low operatic standards prevailing in Italy at that time, and he determined to make his new work distinctive, both musically and intellectually, from anything that had been heard before. He hoped that it would be a wake-up call and an inspiration to other young Italian composers.

Arrigo Boito (Italian pronunciation: [arˈriɡo ˈbɔito]; 24 February 1842 – 10 June 1918), aka Enrico Giuseppe Giovanni Boito, pseudonym Tobia Gorrio, was an Italian poet, journalist, novelist and composer, best known today for his libretti, especially those for Giuseppe Verdi's operas Otello and Falstaff, and his own opera Mefistofele. Along with Emilio Praga, he is regarded as one of the prominent representatives of the Scapigliatura artistic movement.

Born in Padua, the son of Silvestro Boito, an Italian painter of miniatures and his wife, a Polish countess, Józefina Radolińska, Boito studied music at the Milan Conservatory with Alberto Mazzucato until 1861. In 1866 he fought under Giuseppe Garibaldi in the Seven Weeks War in which the Kingdom of Italy and Prussia fought against Austria, after which Venice was ceded to Italy.

His only finished opera, Mefistofele, based on Goethe's Faust, was given its first performance on 5 March 1868, at La Scala, Milan. The premiere, which he conducted himself, was badly received, provoking riots and duels over its supposed "Wagnerism", and it was closed by the police after two performances. Verdi commented, "He aspires to originality but succeeds only at being strange." Boito withdrew the opera from further performances to rework it, and it had a more successful second premiere, in Bologna on 10 April 1875. Boito's revised and drastically cut version also changed Faust from a baritone to a tenor, and it is still frequently performed and recorded today.

Bryn Terfel Jones CBE (Welsh pronunciation: [ˈbrɨn ˈtɛrvɛl]; 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 Leporello, but has subsequently shifted his attention to heavier roles, especially those by Wagner.

Bryn Terfel Jones was born in Pant Glas, North Wales, the son of a farmer. His first language is Welsh. He knew of another Welsh baritone named Bryn Jones, so chose Bryn Terfel as his professional name. He had an interest in and talent for music from a very young age. A family friend taught him how to sing, starting with traditional Welsh songs. After winning numerous competitions for his singing, he moved to London in 1984 and entered the Guildhall School of Music and Drama where he studied under Rudolf Piernay. (He has recorded that he initially applied to the music college in Cardiff but when the reply was addressed to ‘Miss Terfel’ he was so annoyed a Welsh College did not know Bryn was a man's name that he switched to London.) He graduated in 1989, winning both the Kathleen Ferrier Memorial Award and the Gold Medal. The same year he came second behind Dmitri Hvorostovsky in the Cardiff BBC Singer of the World Competition, but won the Lieder Prize.