Answer:
Joyful
Step-by-step explanation:
The prevailing emotion or mood found in the excerpt is joyful. This is clear when we pay attention to the author's approach to the scene, apparently there has been battle and it is done now, and the speaker encourages people to forget it, perhaps because of the misery that comes with war, and instead he incites the audience to focus on singing, dancing all night long, and following Bacchus who led them to make Thebes shake, which are all signs that the author wants to evoke joyful and cheery feelings.