On the Sundays after Pentecost, most of the Communion chants are taken from the Psalms, as indeed are most of the Gregorian propers throughout the year. There are a some exceptions, however, such as the two from John 6, on the 9th and 15th Sundays, and another from Wisdom 16 on the 13th: “Thou hast given us bread from heaven, o Lord...” These are obviously chosen in reference to the Eucharist,
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