My Fair Lady is a musical with a book and lyrics by Alan Jay Lerner and music by Frederick Loewe. The story, based on the 1938 film adaptation of George Bernard Shaw's 1913 play Pygmalion, concerns Eliza Doolittle, a Cockney flower girl who takes speech lessons from professor Henry Higgins, a phonetician, so that she may pass as a lady. Despite his cynical nature and difficulty understanding women, Higgins grows attached to her.

Musical theatre is a form of theatrical performance that combines songs, spoken dialogue, acting and dance. The story and emotional content of a musical – humor, pathos, love, anger – are communicated through words, music, movement and technical aspects of the entertainment as an integrated whole. Although musical theatre overlaps with other theatrical forms like opera and dance, it may be distinguished by the equal importance given to the music as compared with the dialogue, movement and other elements. Since the early 20th century, musical theatre stage works have generally been called, simply, musicals.