0 present participle of echo
1 If a sound echoes or a place echoes with a sound, you hear the sound again because you are in a large, empty space:
2 to repeat details that are similar to, and make you think of, something else:
He had been sensitive to the echoing murmur of the mountains, that communicating of sounds destined to intoxicate sympathetic souls.
Following the rules of choral responsion, the antistrophe matches the metrical pattern of the strophe, echoing its melody while also introducing a marked contrast thematically.
Their songs are conceived and sung in a natural landscape; moreover, this natural landscape participates by echoing back their music.