Albert Barnes Commentary Isaiah 14:7

"The whole earth is at rest, [and] is quiet: they break forth into singing." — Isaiah 14:7 (ASV)

The whole earth is at rest - The kingdom of Babylonia, or Chaldea, extended nearly over the whole pagan world. Now that Babylon was fallen, and that those oppressions would cease, the world is represented as in peace and quietness.

They break forth into singing - That is, the inhabitants of all the nations that were subject to Babylon now rejoice that they are released from its galling and oppressive yoke.