Die Fledermaus and Tamerlano are both part of what genre of classical music?
Tamerlano Tamerlano ("Tamerlane", HWV 18) is an opera seria in three acts written for the Royal Academy of Music theatre company, with music by George Frideric Handel to an Italian text by Nicola Francesco Haym, adapted from Agostin Piovene's "Tamerlano" together with another libretto entitled "Bajazet" after Nicolas Pradon's "Tamerlan, ou La Mort de Bajazet".
Des Knaben Wunderhorn (Mahler) The settings of Des Knaben Wunderhorn by Gustav Mahler are orchestral songs and voice and piano settings of poems from "Des Knaben Wunderhorn" ('The Youth's Magic Horn') a collection of anonymous German folk poems assembled by Achim von Arnim and Clemens Brentano and published by them, in heavily redacted form, between 1805 and 1808. 10 songs set for soprano or baritone and orchestra were first published by Mahler as a cycle in 1905. but in total 12 orchestral songs exist, and a similar number of songs for voice and piano.