Both the liturgies of St. Basil and St. John Chrysostom contain "invariable" prefaces leading up to the Sanctus. LSB similarly offers such a preface in Divine Services 4 and 5.
The preface in DS 4 is based largely on the traditional Swedish rite (took classic shape in 1531, but probably had medieval precedents). The preface in DS 5 is Luther's exhortation to communicants from the German Mass turned into a prayer. Today I want to look only at DS 4's preface.
It is truly good, right, and salutary that we should at all times and in all places give thanks to You, O Lord, holy Father, almighty and everlasting God...
Up to that point, the Preface is of a piece with all Western prefaces. But what is interesting is how it continues:
...for the countless blessings You so freely bestow on us and all creation.
God is the Giver of good gifts - too many to count - and they come to Him in absolute freedom. He bestows them on us because He loves to give - and so all creation is confessed as graced from God. Salvation is ultimately cosmic - and we dare not forget it.
Above all, we give thanks for Your boundless love shown to us when You sent Your only-begotten Son, Jesus Christ, into our flesh and laid on Him our sin, giving Him into death that we might not die eternally.
If thanks is due for creation, what can we say for the unspeakable gift of our redemption - a redemption that encompasses both our Lord's incarnation and His paschal mystery? What greater proof of the Father's love could there ever be than this gift of His Son into our flesh and this laying on Him of all our sin to free us from eternal death?
Because He is now risen from the dead and lives and reigns to all eternity, all who believe in Him will overcome sin and death and rise again to new life.
As the Apology confesses so powerfully, when we speak of the Eucharist, we speak of the living Christ, for we know that death has no more dominion over Him! It is the Body that WAS crucified but that IS NOW risen which we receive and when we do so in faith, neither sin nor death will ever be able to hold us.
Therefore with angels and archangels and with all the company of heaven we laud and magnify Your glorious name, evermore praising You and saying...
The cause of our endless joy and joining in the angel's song then is ultimately this: that the Crucified and Risen One comes to us to free us from sin and death. Here is why we dare to join the Cherubim and Seraphim in their unending hymn!
What we may regret is that more of the Swedish original did not make it in. "When we were in such a bad case that naught but death and eternal damnation awaited us and no creature in heaven or on earth could help us, then You did send forth Your only-begotten Son who is of the same divine nature as Yourself, to take our flesh of the Virgin Mary, did permit Him to undergo death and laid on Him our sin..." But still, what is actually in LSB is a beautiful confession that could be heard and confessed and prayed week in and week out with great joy.