Both are large-scale orchestral pieces by romantic slavic
composers. They are similar, but not very.
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The Hebridies Overture A Midsummer Night's Dream Overture
Overture in C Calm Sea and a Prosperous Voyage Overture The
Beautiful Melusine Overture Ruy Bas Overture Trumpet Overture
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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.