Final answer:
The Hymn theme in the slow introduction of Romeo and Juliet is heard in the Hymn to the Evening.
Step-by-step explanation:
The Hymn theme in the slow introduction of Romeo and Juliet is heard in the Hymn to the Evening.
This is evident in the line - 'SOON as the sun forsook the eastern main The pealing thunder shook the heavenly plain;'
In this passage, the Hymn theme is represented by the music that accompanies the scene and sets the tone for the events to come.