Final answer:
No, each of Vivaldi's concertos was not accompanied by a sonnet that he probably wrote himself.
Step-by-step explanation:
No, each of Vivaldi's concertos was not accompanied by a sonnet that he probably wrote himself. While Vivaldi did write sonnets to accompany some of his concertos, it is unclear if he wrote them all himself. Additionally, not all of Vivaldi's concertos were accompanied by sonnets.