The true act of worship
Appreciation goes to the 
My word of wisdom for the week.
"Nehemiah 12:45 They performed the service and the service of purification, as did also the musicians and the gate keepers, according to the command of David and his son Solomon".
Joy is not the same as happiness. These people were happy, but they were also joyful. Happiness is liking the present moment because it pleases us. We are enjoying the moment and therefore we feel happy. But joy is much deeper and more long-range. Joy appreciates the past, the present, and the future, not because the circumstances are pleasing, but because the heart is right with God. That is what fills us with joy.
the dedication of the wall of Jerusalem, the Levites were sought out from where they lived and were brought to Jerusalem to celebrate joyfully the dedication with songs of thanksgiving and with the music of cymbals, harps and lyres. The singers also were brought together from the region around Jerusalem -- from the villages of the Netophathites, from Beth Gilgal, and from the area of Geba and Azmaveth, for the singers had built villages for themselves around Jerusalem. When the priests and Levites had purified themselves ceremonially, they purified the people, the gates and the wall.
I had the leaders of Judah go up on top of the wall. I also assigned two large choirs to give thanks. (Nehemiah 12:27-31a NIV)
Some of the bible description from other other versions of bible for a clearer view of the bible passage.
Bible in Basic English
And they kept the watch of their God, and were responsible for making things clean, and so did the music-makers and the door-keepers, as it was ordered by David and Solomon his son.
Darby Translation
And, with the singers and the doorkeepers, they kept the ward of their God, and the ward of the purification, according to the commandment of David and of Solomon his son.
Julia Smith Translation
And they will watch the watches of their God, and the watches of the purification, and those singing, and the gate-keepers, according to the command of David, and of Solomon his son.
King James 2000
And both the singers and the gatekeepers kept the charge of their God, and the charge of the purification, according to the commandment of David, and of Solomon his son.
Lexham Expanded Bible
They kept the responsibility of their God and the responsibility of cleansing, and the singers and gatekeepers, according to the command of David and his son Solomon.
Modern King James verseion
And both the singers and the gatekeepers kept the charge of their God, and the charge of the cleansing, according to the command of David and of Solomon his son.
Modern Spelling Tyndale-Coverdale
that they stood and waited upon the office of their God, and the office of the purification. And the singers and porters stood after the commandment of David and of Solomon his son:
Here are the choirs, the instrumentalists and the singers, all gathered to celebrate the great achievement of building this wall. They were not only celebrating but they were dedicating. There are many occasions in the life of a people for both celebrating and dedicating.
Amplified
And they performed the due service of their God and of the purification; so did the singers and gatekeepers, as David and his son Solomon had commanded.
