Zelmira (] ) is an opera in two acts by Gioachino Rossini to a libretto by Andrea Leone Tottola.
 Based on the French play, "Zelmire" by de Belloy, it was the last of the composer's Neapolitan operas.
 Stendhal called its music Teutonic, comparing it with "La clemenza di Tito" but remarking: "...while Mozart would probably, had he lived, have grown completely Italian, Rossini may well, by the end of his career, have become more German than Beethoven himself!"
Eduardo e Cristina (] ) is an operatic 'dramma' in two acts by Gioachino Rossini to an Italian libretto originally written by Giovanni Schmidt for "Odoardo e Cristina" (1810), an opera by Stefano Pavesi, and adapted for Rossini by Andrea Leone Tottola and Gherardo Bevilacqua-Aldobrandini.
Ermione (1819) is a tragic opera (azione tragica) in two acts by Gioachino Rossini to an Italian libretto by Andrea Leone Tottola, based on the play "Andromaque" by Jean Racine.
Gioachino Antonio Rossini (] ; 29 February 179213 November 1868) was an Italian composer who wrote 39 operas, as well as some sacred music, songs, chamber music and piano pieces.
Mosè in Egitto ("Moses in Egypt)" (] ) is a three-act opera written by Gioachino Rossini to an Italian libretto by Andrea Leone Tottola, which was based on a 1760 play by Francesco Ringhieri, "L'Osiride".
 It premièred on 5 March 1818 at the recently reconstructed Teatro San Carlo in Naples, Italy.
Il castello di Kenilworth (or, under its original name in 1829, Elisabetta al castello di Kenilworth) is a "melodramma serio" or tragic opera in three acts by Gaetano Donizetti.
 Andrea Leone Tottola wrote the Italian libretto after Victor Hugo's play "Amy Robsart" (1828) and Eugene Scribe's play "Leicester", both of which following from Scott's novel "Kenilworth" (1821).
 Daniel Auber composed another opera on the same subject, "Leicester, ou Le chateau de Kenilworth" in 1823.
Andrea Leone Tottola (died 15 September 1831) was a prolific Italian librettist, best known for his work with Gaetano Donizetti and Gioachino Rossini.
Alfredo il grande ("Alfred the Great") is a "melodramma" serio or serious opera in two acts by Gaetano Donizetti.
 Andrea Leone Tottola wrote the Italian libretto, which may have been derived from Johann Simon Mayr's 1818 opera of the same name.
 The opera tells the story of the Anglo-Saxon king Alfred the Great.
Il fortunato inganno (The Happy Deception) is an "opera buffa" in two acts by Gaetano Donizetti, to a libretto by Andrea Leone Tottola.
 Composed in 1823, it was first given on September 3 of that year at the Teatro Nuovo in Naples.
 It was not a success, and has disappeared from the repertory.
L'ultimo giorno di Pompei ("The last day of Pompeii") is an opera ("dramma per musica") in two acts composed by Giovanni Pacini to an Italian libretto by Andrea Leone Tottola.
 It premiered to great success at the Teatro San Carlo in Naples on 19 November 1825 followed by productions in the major opera houses of Italy, Austria, France, and Portugal.
 When Pacini's popularity declined in the mid-19th century, the opera was all but forgotten until 1996 when it received its first performance in modern times at the Festival della Valle d'Itria in Martina Franca.
 "L'ultimo giorno di Pompei" influenced either directly or indirectly several other 19th-century works, most notably Karl Bryullov's 1833 painting, "The Last Day of Pompeii".

Question: What type of music, is the Italian composer who was supported by Andrea Leone Tottola, a prolific librettist, best known for? 
Answer: opera