Here "Judah" refers to the people from Judah. AT: "All the people of Judah" (See: [[rc://en/ta/man/translate/figs-metonymy]])
# Kohathites and Korahites
These are the names of people groups descending from Kohath and Korah. (See: [[rc://en/ta/man/translate/translate-names]])
# with a very loud voice
This speaks of all the people praising Yahweh as if they together had one voice. AT: "with very loud voices" (See: [[rc://en/ta/man/translate/figs-metaphor]])