A classical music composer (in the romantic style).
classical and romantic
Rossini lived during the Romantic Era, although his music is said to have a link between the romantic and classical periods.
I believe you mean the William Tell Overture by Rossini.
If you are referring to Gioachino Rossini, he was a Romantic composer, not a painter. He composed over 39 operas, including William Tell and The Barber of Seville.
After 10 seconds of google-ing I found your answer... ... yes, Rossini was an Italian composer.
Cioachino Rossini was an Italian composer.
Gioachino Rossini
Opera music composer
The opera 'William Tell' was composed by Rossini. That included the overture, of course.
If this is about the composer, its Gioachino Rossini.
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."