In music, solfège (French pronunciation: [sɔl.fɛʒ], also called solfeggio, sol-fa, solfedge, or solfa) is a pedagogical solmization technique for the teaching of sight-singing in which each note of the score is sung to a special syllable, called a solfège syllable (or "sol-fa syllable"). The seven syllables commonly used for this practice in English-speaking countries are: do (or doh in tonic sol-fa),re, mi, fa, sol (so in tonic sol-fa), la, and ti/si, which may be heard in "Do-Re-Mi" from Rodgers and Hammerstein's score for The Sound of Music, as well as the Robert Maxwell song "Solfeggio". In other languages, si is used (see below) for the seventh scale tone, while its earlier use in English continues in many areas.

There are two methods of applying solfege: fixed do (used in China, France, Italy, Portugal, Spain, Romania, Russia, South America and parts of North America, Japan, and Vietnam) and movable do (used in the United Kingdom, Germany, Hungary, Indian classical music, and the United States).

Alexandre Astier (born 16 June 1974 in Lyon, France) is a French writer, director, editor and actor.

He is most known as the writer, editor, director and lead actor of the French television series Kaamelott, in which he also plays King Arthur.

He is the son of Lionnel Astier (Léodagan in Kaamelott) and Joëlle Sevilla (Séli in Kaamelott). He studied music at the conservatory and at the American School of Modern Music of Paris. He also studied acting and screenwriting.

His four children have featured in Kaamelott. His daughters Ariane and Jeanne Astier play respectively Mehben and Mehgan, the daughters of Karadoc and Maevanwi (in the episodes Pupi and Exiles). His son Neil (who also appears as Karadoc and Mevanwi's son in Pupi) plays young Arthur in the season Book V, and in the final scene of Book VI. Ethan, Astier's youngest son, plays Arthur's dream heir in Book V. Moreover, his wife, Anne-Gaëlle Daval, hie head of the costume designs on Kaamelott and the short film Dies Irae.

Alexandre Astier first got attention from the Lyon's public thanks to the play Le Jour du froment. He also acted in Nous Crions Grâce, a play written and directed by Jacques Chambon, to whom he gave the role of Merlin in Kaamelott.