In which way was Purcell influenced when moving the plot forward through a series of "numbers"?

Purcell was significantly influenced by Italian and French opera composers when advancing the plot through a series of "numbers." This approach involved the use of distinct musical sections, or "numbers," which allowed for a more dramatic and expressive way to convey the characters' emotions and the narrative.

Italian opera, in particular, introduced the idea of integrating arias, recitatives, and ensembles to create a more dynamic and engaging storytelling format. French operatic traditions also emphasized the importance of dance and lyrical melody within their operas, contributing to Purcell's style and his ability to blend different musical elements seamlessly.

These influences helped Purcell to innovate and adapt traditional English musical forms, ultimately enriching the experience of English opera and making it more sophisticated and emotionally resonant. Such a blending of styles is evident in his operas and music theater works, where the transition between different musical forms supports the unfolding drama effectively.