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[ The use made of the old choral melody was first remarked by Rochlitz, but he calls the chorale, "Aus tiefer Noth schrei ich zu dir" (A. M. Z., I., p. 148), while Gerber (N. Lex., III., p. 496) calls it, "Christ unser Herr zum Jordan kam," and Zelter (Briefw., III., p. 415; IV., p. 354), "Wenn wir in hochsten Nöthen"—variations which are capable of explanation, and sometimes of justification (Càcilia, VIII., p. 134. A. M. Z., XLVIII., p. 481).]
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[ The antiquated melody treated by Mozart is the song, "Ach Gott vom Himmel sieh darein," in use from 1524 (Winterfeld, Evang. Kirchengesang, I., Beil. 14; II., p. 7. Tucher, Schatz des evang. Kirchengesanges Mel., 236).]
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[ Kirnberger, Kunst d. reinen Satzes, I., p. 237.]
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[ Kirnberger, I., p. 243. Cf. Stadler, Nachr., p. 12.]
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[ Wien. Mus. Ztg., 1842, p. 58.]