No. It's just a free form chant/sing of a similar refrain or verse repeated. It was used around the special prayers for the couple which were read by their family members.
See my answer above about the Taize. Sorry I forgot to use the reply feature. Here in the USA Taize has more of a hippy feel to it. That's why I tend not to care for it. However, they used it in a limited form beautifully in this service around the prayers for the couple read by family members.
Lellobeetle novus ordo partly Traditional Latin (Gloria chanted in Latin). Taize not familiar but I think that is not Roman Catholic. The bride and groom are Roman Catholic. Pope Paul vi destroyed the Traditional Catholic Latin Mass of the Roman Rite and change it to Protestant Mass.
0:00 - Prayer of the Faithful: "Ubi Caritas" (Jacques Berthier); prayers given by Prince Louis of Luxembourg in Luxembourgish, Princess Louise su Stolberg-Stolberg in German, Count Amaury de Lannoy in French, the Duchess of Braganza in Portuguese, Countess Alice de Lannoy in Dutch, and Prince Felix of Luxembourg in English 5:10 - The Liturgy of the Eucharist - Offertory: "Psalm 42, 1st Movement" (Felix Mendelssohn Bartholdy)
Homosexual Prince 'weds' aristocratic 'bride' under pressure of his Catholic, conservative and on power fixed family. Sad... Guillaume must be learn from beautiful example of Mr. Xavier Bettel, who is mayor of Luxembourg and proud openly gay. He, Mr. Bettel, is representing Luxembourg of today with liberal values of freedom and tolerance much more better than all 'royal family' !