Every one of his officials was summoned to attend. There was A great crowd. They Came from all far off corners of his great kingdom. They wore their best uniforms or clothing. This was an important celebration.
Any big celebration calls for music.
So the King assembled A great Orchestra. They rehearsed and practiced. There would be Lots of music. World likes to make sin and idolatry look so attractive and fun. The most important music they would play would be the signal for everyone to bow down.