In David's time there were four thousand Levites among all the Levites who were dedicated to the service of song in the house of God (1 Chronicles 23:5). You find writers today saying, ‘What huge orchestras they had! Thousands of people available for this. This is the licence for today. But if only they would read the details. Included among the four thousand were the players of instruments as well as the singers; they were the same people. The choirs and the instrument players were taken out of the same allocation of four thousand. The arrangement was that those Levites had a tour of duty in Jerusalem of just two weeks a year. So when you divide four thousand by twenty-six, then you're getting a more realistic figure of how many Levites were involved in the service of song in the temple at any one time, and you get down to about 150 plus. Nor could the same people sing in the temple twenty-four hours of the day, seven days a week for two weeks. There were obviously shifts. How many? Let us say three shifts. But if you say only two shifts you have still got only seventy-five people, assuming they are all fit and well, at your disposal. From that seventy-five people the choir and the orchestra for the temple have to be supplied. In David's time we are given a figure. The orchestra consisted of twenty-seven people, most of them playing stringed instruments, and in a big place like the temple with its two huge courtyards and it's up to four or five thousand people at any time, pilgrims in town, that is not a massive number. It is nothing like a great band with lots of percussion and amplification and ear-splitting noise. It is a very refined and gentle kind of arrangement that they had. People think that Psalm 150 justifies everything, and they simply won't study the detail.