Bordogni refers to a series of vocal exercises composed by the Italian musician Marco Bordogni in the 19th century. These exercises are designed to help singers develop their technique, improve their vocal agility, and enhance their overall performance skills. They are widely used in voice training and are particularly popular among students and teachers of classical singing. The Bordogni exercises typically focus on various aspects of vocal production, including breath control, pitch accuracy, and phrasing. They are often performed using different vowel sounds and can be adapted for various voice types, making them a versatile tool in vocal pedagogy.