Overture (French ouverture, lit. "opening"; German Ouvertüre, Vorspiel, i.e., "prelude", lit. "play before") in music is the term originally applied to the instrumental introduction to an opera. During the early Romantic era, composers such as Beethoven and Mendelssohn began to use the term to refer to independent, self-existing instrumental, programmatic works that presaged genres such as the symphonic poem. These were "at first undoubtedly intended to be played at the head of a programme".
The idea of an instrumental opening to opera existed during the 17th century. Peri's Euridice opens with a brief instrumental ritornello, and Monteverdi's L'Orfeo (1607) opens with a toccata, in this case a fanfare for muted trumpets. More important, however, was the prologue, which comprised sung dialogue between allegorical characters which introduced the overarching themes of the stories depicted.
When lonliness lays
her huring hands on me,
There's a place I always can go
I'll pour out my soul, to my old piano
And I let those old ivories cry for me
Ivory tears, ivory tears,
my old piano cries for me,
Ivory tears, ivory tears,
dripping from every melody
Some lonely people,
they turn to the jukebox,
Others turn to whiskey and wine
But, when it's crying time for me,
well, I turn to my ol' piano
And I let those old ivories
cry for me
Ivory tears, ivory tears,
my old piano, it's crying, crying
Ivory tears, ivory tears,