Mattins

In both, a division was made between the first 109 psalms, -- which were mainly allotted to the night services, i.e. to those which were afterwards called Mattins, -- and the rest which were mainly allotted to the Evening Service (Vespers).

The Prayer Book Explained Percival Jackson

Sundays had 18 psalm Mattins divided into three nocturns each containing three lessons. 12 pss in the first nocturn.

Old Mass and old breviary 2009

Mattins: No Hymn on the day itself, but within the Octave and on the Octave day, Hostis Herodes, as above.

The Epiphany Office bls 2009

Here, too, are "The Responses" - also from the Westminster Abbey Choir, and for Mattins - although it doesn't give a composer:

Archive 2009-08-01 bls 2009

Here, too, are "The Responses" - also from the Westminster Abbey Choir, and for Mattins - although it doesn't give a composer:

Anglican Chant, the second installment bls 2009

Not surprisingly many, many double feasts were introduced Battifol goes into great detial about this so the chances of having an 18 psalm Mattins on a Sunday was pretty slim by the reign of Leo XIII and the shorter, festal, double Office celebrated on the Sunday.

Old Mass and old breviary 2009

The recitation of the Psalter took place at Mattins Ps 1, Beatus vir, being the first psalm of Sunday Mattins with Pss 1 - 108 and Vespers with 109-147.

Old Mass and old breviary 2009

Lastly, here's a beautiful version of the original Verbum supernum prodiens (the Mattins hymn), composed by Damijan Močnik and sung by the University of Utah Singers (unfortunately, the sound is not very strong):

Verbum Supernum Prodiens bls 2009

Doubles had 9 psalm Mattins divided into three nocturns whilst ferial days and simples had a single nocturn containing 12 psalms and three lessons.

Old Mass and old breviary 2009

Hymn melodies for the whole year from the Sarum service-books lists Verbum Supernum Prodiens as a Mattins hymn during Advent:

Verbum Supernum Prodiens bls 2009