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2 Added actual pamphlet and another note
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According to the pamphlet that came with the CD, the lyrics are from the Sefardi nusach of Nishmas.

From Shwekey's "Maamin B'Nissim/We Are a Miracle" album

EDIT: That said, after actually looking at the various nusachos, it seems that the citation from Nishmas refers only to the first line, and that the line בדרך המלך נלך לעולם ועד was borrowed from Bamidbar 21:22 and went uncited for some reason.

According to the pamphlet that came with the CD, the lyrics are from the Sefardi nusach of Nishmas.

According to the pamphlet that came with the CD, the lyrics are from Nishmas.

From Shwekey's "Maamin B'Nissim/We Are a Miracle" album

EDIT: That said, after actually looking at the various nusachos, it seems that the citation from Nishmas refers only to the first line, and that the line בדרך המלך נלך לעולם ועד was borrowed from Bamidbar 21:22 and went uncited for some reason.

1
source | link

According to the pamphlet that came with the CD, the lyrics are from the Sefardi nusach of Nishmas.