For 10 points—name this composer of Water Music and Music for Royal Fireworks who wrote an oratorio including sections entitled "For Unto Us a Child is Born" and a notable "Hallelujah" chorus, his Messiah.
He wrote an opera in which Araspe loves Seleuce, the wife of the title character, and one in which Sesto sings the aria "Svegliatevi nel core" and Cleopatra sings the aria "Tu la mia stella sei".  This composer of Tolomeo and Giulio Cesare wrote incidental music to The Alchemist which features movements taken from the extended overture to his opera Rodrigo, and he wrote 3 oboe concertos, as well as 24 concertos for organ.  Another work by this composer includes three suites in F, D, and G major and four minuet movements, and he wrote one work whose fourth movement is called "La Réjouissance" and whose finale movement consists of two minuets.  For 10 points—name this composer of Water Music and Music for Royal Fireworks who wrote an oratorio including sections entitled "For Unto Us a Child is Born" and a notable "Hallelujah" chorus, his Messiah.
He wrote an opera in which Araspe loves Seleuce, the wife of the title character, and one in which Sesto sings the aria "
George Friedrich {Handel}