Excerpts from Sacrosanctum Concillium
Sacrosanctum Concilium, no. 4
"Lastly, in faithful obedience to tradition, the sacred Council declares that holy Mother Church holds all lawfully acknowledged rites to be of equal right and dignity; that she wishes to preserve them in the future and to foster them in every way."
Sacrosanctum Concilium, no. 36
“[...] the use of the Latin language is to be preserved in the Latin rites."
Sacrosanctum Concilium, no. 116
"The Church acknowledges Gregorian chant as specially suited to the Roman liturgy: therefore, other things being equal, it should be given pride of place in liturgical services."