Here they are at last. I've been having some trouble with Gloria TV but my persistence has been rewarded.
Introit Cibavit eos, sung by all.
The Gradual and Alleluia, sang by a smaller group of cantors. We also (all) sang the Sequence, but the camcorder couldn't cope with the sound of the organ which accompanied it.
The Offertory, Sacerdotes Domini, sung by the cantors.
The Communion, sung by all, in alternation with the verses of Psalm 22.
The Introit and Communion verses are, in fact, antiphons for psalsm, although the psalms are usually not sung any longer. It is still possible to sing them, however, and at communion there is usually time. The correct psalm (in the correct psalm-tone) for each Introit and Communion is given in a book 'Versus Psalmorum et Canticorum' (1962) which can be downloaded for free from the Church Music Association of America here, and bought hard copy (2008 reprint) from them via Lulu here.
The custom of singing the psalm with the communion verse seems an admirable one to me, and it has long been followed in Oxford; it is also done commonly at St Bede's Clapham Park and at the St Catherine's Trust Summer School - and no doubt other places as well.