Alleluia Attendite popule meus in legem

The same textual incipit can be found in Schlager’s repertory of Alleluia (224 D-F, p. 173) but with a different musical incipit (see: http://www.univ-nancy2.fr/MOYENAGE/UREEF/MUSICOLOGIE/CMN/indexcmn.htm ). Also, the same textual incipit can be found in older Graduals like GB 253 *GS 149 *SYG 243 (see Global Chant: http://www.globalchant.org/text-details.php?text=Alleluia.-Attendite-popule ). However the Alleluia in Iluminado 84 has a different melody.