Who Really Does the Singing?

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"...
Sing oh Daughter of Zion;
Shout aloud oh Israel!
Be glad and rejoice with all your heart,
O Daughter of Jerusalem!

The Lord has taken away your punishment,
He has turned back your enemy.
The Lord the King of Israel is with you;
never again will you feel any harm.

On that Day they will say to Jersualm,
'Do not fear O Zion,
Do not let your hands hang limp.

The Lord your God is with you,
He is mighty to save.
He will take great delight in you,
He will quiet you with His love,
He will rejoice over you with singing.'

..."

Hmmm....?