I think the significance of their argument had brought them to marriage. Both Lomov and Natalya often argue about the land that is situated between their properties. At first Lomov, only wanted to propose to Natalya because of their circumstance. However, Lomov had slowly fallen for her.
The music was blasting, andit filled the room
This is a metaphor.
Similies use "as" or "like" to explicitly denote a comparison and personifications give human-like characteristics to animals, objects, or concepts.
Hope this helps! :)