Di quella pira from Il Trovatore
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The song is called "The Flower Duet". Here is the Wikipedia article: http://en.wikipedia.org/wiki/The_Flower_Duet
You probably mean opera music. Opera is when a singer uses their full lungs to sing very high pitched notes. Most opera songs are in Latin. If you want more info look up opera on wikipedia!
Opera.
Which Commercial?
In opera it would be called an overture. Overtures are routinely made up of a selection of the music that makes up the opera. In other pieces of music it might simply be called an introduction.