Does the "barber of seville" sing originally in Spanish or Italian?

Answer 1

Since your question appears in the Music section, you might be interested by the fact that Figaro, the barber of Seville, appears in two operas both sung in Italian.
"Il Barbiere di Siviglia" was composed by Rossini on a libretto by Cesare Sterbini.
"Le Nozze di Figaro" was composed by Mozart on a libretto by Lorenzo da Ponte.
Interestingly both Italian librettists based their text very closely on the original plays which were written in French by the dramatist Beaumarchais.
"The Marriage of Figaro" was the sequel of "The Barber of Seville" but, in fact, the Mozart opera was composed and performed in 1786, thirty years earlier than Rossini's (1816).
Both operas are favourites amongst American music lovers and are frequently broadcast from the MET.
You will find the list of arias in Italian for both operas on the following website. (Click on blue for The Barber's).

http://www.harmetz.com/soprano/synopsis/marriagefigaro.htm

Answer 2

Lyric is in Italian.
IL BARBIERE DI SIVIGLIA has been composed by the Italian Gioacchino Rossini.
See the link of Wikipedia
http://en.wikipedia.org/wiki/The_Barber_of_Seville