King Arthur, or The British Worthy (Z. 628), is a semi-opera in five acts with music by Henry Purcell and a libretto by John Dryden. It was first performed at the Queen's Theatre, Dorset Garden, London, in late May or early June 1691.The "Frost Scene" in the third act has always attracted praise from critics. Edward J. Dent wrote that "The Frost Scene is one of Purcell's most famous achievements" with "its bold contrasts of style, and the masterly piling up of the music to a climax at the end of the chorus ''Tis love that has warmed us'." Thomas Gray, commenting on the 1736 production, described it as "excessive fine" and claimed that the Cold Genius' solo was "the finest song in the play." This aria ("What power art thou who from below") is accompanied by shivering strings, probably influenced by a scene from Act IV of Jean-Baptiste Lully's opera Isis (1677) but, as Peter Holman writes, Purcell's "daring chromatic harmonies transform the Cold Genius from the picturesque figure of Lully (or Dryden, for that matter) into a genuinely awe-inspiring character — the more so because Cupid's responses are set to such frothy and brilliant music."