You may find these and other differences between the Traditional Latin ('Tridentine') Mass and the New (Novus Ordo) Mass of the 1960's (most commonly said at Catholic parishes at the end of the 20th century
Photograph's below is His Holiness Pope Emeritus Benedict XVI who used during the 1990's and 2000 prior to and during his pontiff the Traditional Latin Mass. This prompted him to put in to force in 2007 the Motu Proprio. The text can be read here.
When issued by the Pope, a motu proprio may be addressed to the whole Church, to part of it, or to some individuals. A document issued motu proprio has its legal effect even if the reasons given for its issuance are found to be false or fraudulent, a fact which would normally render the document invalid. Its validity is based on its issuance by the pope by his own initiative, not upon the reasons alleged.
The first motu proprio was promulgated by Pope Innocent VIII in 1484. It continues to be a common form of Papal rescripts, especially when establishing institutions, making minor changes to law or procedure, and when granting favours to persons or institutions.
The Pope considered that allowing the Tridentine Mass to those who request it was a means to prevent or heal schism, stating that, on occasions in history, "not enough was done by the Church's leaders to maintain or regain reconciliation and unity" and that this "imposes an obligation on us today: to make every effort to enable for all those who truly desire unity to remain in that unity or to attain it anew."
Rorate Caeli reported on the “explosive revelation,” which came to light in Magister’s analysis of... the Francis pontificate to date, agreeing that Francis’ restriction does indeed undermine the authority of the Summorum Pontificum itself.
On the 7 July 2007, Benedict XVI issued the motu proprio Summorum Pontificum, declaring that upon "the request of the faithful", celebration of Mass according to the Missal of 1962 (commonly known as the Tridentine Mass), was to be more easily permitted. Stable groups who previously had to petition their bishop to have a Tridentine Mass may now merely request permission from their local priest. While Summorum Pontificum directs that pastors should provide the Tridentine Mass upon the requests of the faithful, it also allows for any qualified priest to offer private celebrations of the Tridentine Mass, to which the faithful may be admitted if they wish. For regularly scheduled public celebrations of the Tridentine Mass, the permission of the priest in charge of the church is required.
In an accompanying letter, the Pope outlined his position concerning questions about the new guidelines. As there were fears that the move would entail a reversal of the Second Vatican Council, Benedict emphasised that the Tridentine Mass would not detract from the Council, and that the Mass of Paul VI would still be the norm and priests were not permitted to refuse to say the Mass in that form. He pointed out that use of Tridentine Mass "was never juridically abrogated and, consequently, in principle, was always permitted." The letter also decried "deformations of the liturgy ... because in many places celebrations were not faithful to the prescriptions of the new Missal" as the Second Vatican Council was wrongly seen "as authorising or even requiring creativity", mentioning his own experience.
Pope Emeritus Benedict XVI allegedly feels that his “Summorum Pontificum“ decree has been “wounded” by Pope Francis’ decision to restrict the Latin Mass, which Benedict’s 2007 apostolic letter had explicitly allowed. Italian journalist Sandro Magister reported that in “conversations with his visitors” Benedict has revealed his private opinion of the Francis-initiated limitation.
FR. HESSE CONFIRMS IF THE NEW MASS IS VALID OR NOT
0:49 – “Now first you have to know that the so-called Tridentine Mass or the so-called Latin Mass: those are both confusing terms because there is no such thing as a ‘Latin Mass’ in the way it is used nowadays and there is no such thing as a ‘Tridentine Mass’. There is only THE Mass – rite – of the Catholic Latin Church.” 1:55 – The traditional Mass goes back to the time of the Apostles. When St. Gregory the Great added a few words to the canon of Mass, the people in Rome were outraged and they