Technically, Mass I is the Mass that should be sung during Paschal-tide:
I want to thank Mr. Joseph Kopp at King Richard's and sacristan at St. Michael Church (SSPX) for sending me this information. I honestly had no idea about this until recently. I always presumed that in pre-Vatican II times the choir director chose what she wanted to choose, but in fact it was all made clear what should be done.
Has the time come again for this. How difficult would it be to put our English translation to these notations? We've done it for Mass VIII in the new Roman Missal. And Mass VIII which is for Christmas through Epiphany, is the only Latin version our Ordinary Form Mass uses and normally just for Advent and Lent which is wrong to use in that season--How did we veer off track? Through our faults, through our faults, through our most grievous faults!
All this information comes from the (“Liber Usualis”) which is the liturgical book (1962) that has all the masses for the year. (In the traditional rite.)
Mass XVII – For the Sundays of Advent and Lent.
Mass VIII – ( De Angelis ) For Christmas through Epiphany. (any white Sundays)
Mass XI – (Orbis factor) For Sundays throughout the year. (green Sundays)
Mass IX – (Cum jubilo) For first class feast days of the BVM and also used for the Mass on Maundy Thursday.
Mass I – ( Lux et origo) In Paschal time. (from the Easter vigil to Pentecost.)
Credo I – For the Sundays of Advent and Lent.
Credo III – For all other Sundays of the year.
(Sprinkling of Holy water before a sung Mass on Sundays.) (only Sundays) (using a cope and stole in the color of the Sunday.) (if you don’t have all the different color copes dress in alb, stole, cincture for Mass. The chasuble and maniple are in the sanctuary on the sedilia for you to vest for Mass.
1.) Aserges – Sung during all the Sundays outside Paschal time.
2.) Vidi aquam – Sung during the Sundays of Paschal time.
The nuptial Mass (Mass VIII)
The Requiem (this Mass is fixed and has its own Kyriale.)