What kind of dramatic work does Semele and Arabella have in common?
Semele (Handel):  Based on a pre-existent opera libretto by William Congreve, the work is an opera in all but name but was first presented in concert form at Covent Garden theatre on 10 February 1744. Arabella: Arabella, Op. 79, is a lyric comedy or opera in three acts by Richard Strauss to a German libretto by Hugo von Hofmannsthal, their sixth and last operatic collaboration.
opera