Learn to sing the Alleluia with a step by step approach using solfege with repetitions at sections and clauses then applying the texts. Suitable for beginners.
Other Propers for the 15th Sunday after Pentecost are serially listed in the link below;
https://podcasts.apple.com/us/podcast/solfeggio-gregorian-chant-lesson/id1697567668?uo=4