'Sing' in the Bible

And it cometh to pass, in their coming in, in David's returning from smiting the Philistine, that the women come out from all the cities of Israel to sing -- also the dancers -- to meet Saul the king, with tabrets, with joy, and with three-stringed instruments;

And the servants of Achish said unto him, Is not this David the king of the land? did they not sing one to another of him in dances, saying, Saul hath slain his thousands, and David his ten thousands?

Isn’t this the David they sing about during their dances:Saul has killed his thousands,but David his tens of thousands?”