The tenth (song) in time to come, viz. (Isaiah 42;10) "Sing to the L–rd a new song, His praise from the end of the earth (Ibid. 48:42) "Say: The L–rd has redeemed His servant Jacob. All of the (other) songs are denominated in the feminine ("zoth"). Just as a female bears (and then travails again), so, the past salivations were followed by subjugation. But the future (ultimate) redemption will not be followed by subjugation — wherefore it is denominated in the masculine ("zeh" [viz. Isaiah 26:1]).
As it is written (Jeremiah 30:6) "Ask now and see if a male has ever given birth. Why, then, do I see that every man puts his hands upon his loins (as a woman giving birth?") For just as a male does not bear (and thus travail), so, the future redemption will not be followed by subjugation. As it is written (Isaiah 45:17) "Israel will be saved by the L–rd, an eternal salvation. You will not be ashamed or abashed forever."