Levites:
They were "set apart, " handled the sacred articles of the
tabernacle, served as substitutes for the firstborn who belonged to
God, taught the law of God, served as judges, enhanced the worship
at the temple in music, and guarded the treasures and moneys
associated with the temple, but did not serve as mediators of the
covenant.
Their significant contribution was that they made it possible for
the people to worship and fulfill their obligations to God.
Along with the honor that the Levites had in their unique
appointment, there was the need for their total dedication to the
work of the Lord, not that of pursuing material gain, and the
necessity to look to him to supply some of their needs through the
people.
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P&W - Praise and Worship group. 
