Antonio Vivaldi’s father, Giovanni Battista Vivaldi, … was a barber before becoming a professional violinist, and was one of the founders of the Sovvegno dei musicisti di Santa Cecilia, an association of musicians. He taught Vivaldi to play the violin and then toured Venice playing the violin with his young son.
In September 1703, Antonio Vivaldi became maestro di violino (master of violin) at an orphanage called the Pio Ospedale della Pietà (Devout Hospital of Mercy) in Venice. While Vivaldi is most famous as a composer, he was regarded as an exceptional technical violinist as well. The German architect Johann Friedrich Armand von Uffenbach referred to Vivaldi as “the famous composer and violinist” and said that “Vivaldi played a solo accompaniment excellently, and at the conclusion he added a free fantasy [an improvised cadenza] which absolutely astounded me, for it is hardly possible that anyone has ever played, or ever will play, in such a fashion.” — “Antonio Vivaldi,” Wikipedia
— posted by Roger W. Smith