A Baroque opera like Henry Purcell's Dido and Aeneas wouldn't seem to have much in common with a solo violin concerto like Antonio Vivaldi's

A Baroque opera like Henry Purcell's Dido and Aeneas wouldn't seem to have much in common with a solo violin concerto like Antonio Vivaldi's "Spring" from The Four Seasons, but in both works drama is a key element.

What evidence of Baroque drama do you hear in these pieces? In what ways do you think the harmony supports the drama of the music?