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Gioacchino Rossini composed the "William Tell" Opera.
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According to Wikipedia:
"The overture to the opera William Tell, with its high-energy finale, is a very familiar work composed by Gioachino Rossini in 1829."
An overture is an orchestral movement played at the beginning of an opera.
The opera "William Tell" begins with its overture, the William Tell Overture.
William Tell Overture