Questions pertaining to Leviim (Levites, members of the Tribe of Levi).
Levi was the third son of Jacob. The Tribe of Levi always remained loyal to Hashem, both in Egypt and also by not worshipping the golden calf. They were rewarded with special privileges that would otherwise have belonged to the firstborn of Israel.
These special privileges involved carrying the Mishkan [the Tabernacle] and all its furniture when travelling in the desert and serving in the Temples in Jerusalem. The Leviim were musicians and singers who accompanied the Kohanim as they offered the sacrifices in the Temple. In addition, the Leviim served as teachers of Torah, touring the country and instructing the people in the ways of the Torah.
For more see here.
