This is the 14856th most frequent Russian word.
повсюду
Everywhere.
The word "повсюду" is used here to describe the state of being scattered all around or over the surface (the table specifically in this case).
На столе повсюду разбросаны книги.
Books are scattered everywhere on the table.
In this sentence, "повсюду" indicates that people were present in various places throughout the city.
Повсюду в городе было много людей из-за праздника.
There were many people everywhere in the city because of the holiday.
Here, "повсюду" conveys that the sounds of music were pervasive and could be heard from all directions.