The French ensemble "Custodiae" is preparing a very nice album, including, among other things, this very beautiful polyphonic version of the Gradual "Audi Filia": https://www.youtube.com/watch?v=awt6oZ3c__o
The composer of the group, Paul Lebaillif, has some other nice compositions too. For Sundays 17 to 21 of Ordinary Time in Year B, the piece Ad quem ibimus? is quite nice. It has several quotations from John 6.
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