L'Olimpiade, an opera, as perform'd at the King's-Theatre in the Hay-Market : The music by several eminent masters. Executed under the direction of Signor Guglielmi, a neapolitan composer. The poetry of this opera originally belonged to metastasio; to which, without prejudice to the principal action, an entire new turn is given, some airs changed, different parts of the recitative altered, the quintetto added in the second act, and the duet in the third.