David and his allies have recovered the ark of God and celebrate with joy to the rhythm of the music.
David knew what the ark of God represented; for him, it was important to have it because it meant that God was present there, and David wanted to have God on his side.
When you want to carry out a project that you consider important and want to succeed, you will generally seek to partner with the most prepared and capable people to ensure the success of your mission.
David was anointed before he was 20 years old, which tells us that he had a time of preparation and waiting before being king.