13:8a David and all the Israelites were celebrating before God with all their might,

David and all the Israelite people celebrated in God’s presence. They danced. They could not have danced any better.
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David and all the Israelites were singing and dancing with all their strength to praise God. (EEB)

13:8b with songs and on harps and lyres, with tambourines, cymbals, and trumpets.

They sang songs. And they used lyres, harps, tambourines, cymbals and trumpets to make music. (Easy English Bible)
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They made music with harps, lyres, tambourines, cymbals and trumpets. (EEB)

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