Introitus: Lex Domini irreprehesibilis 

gp638 The aim of the Graduale project is to record all of the chants contained in the current Graduale Romanum / Graduale Triplex - see gregoriana.sk/g... for description.
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Look for the chant in Graduale Romanum 1974, p. 86 (Tempus Quadragesimae, Hebdomada I, Sabbato)
Or in Graduale Romanum 1961, p. 122
The red neumes are from Einsiedeln, Stiftsbibliothek, Codex 121(1151), p. 129 - Graduale - Notkeri Sequentiae (www.e-codices.u...)
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