Miriam an were] As some thinke alternately, or by turnes with the men; or that the women repeated those words, Sing ye to the LORD, &c. as the close or burden of the song, as in the 136. Psalme. for his mercy endureth for ever, which cometh in at the end of every verse; and the burden of this song might be the words of the first verse, repeated by Miriam in this verse, or (being a Prophetesse) she might sing another song like unto it.