There is a medieval Christmas carol that expresses the idea of Mary as Mystical Rose beautifully. It has been set to music numerous times, recently by composers as diverse as Benjamin Britten and Sting. The poem is written in macaronic style, meaning it combines two different languages: in this case, English and Latin.
There is no rose of such vertu
As is the rose that bare Jesu;
Alleluia.
As is the rose that bare Jesu;
Alleluia.
For in this rose contained was
Heaven and earth in lytle space;
Res miranda.
Heaven and earth in lytle space;
Res miranda.
By that rose we may well see
That he is God in persons three,
Pari forma.
That he is God in persons three,
Pari forma.
The angels sungen the shepherds to:
Gloria in excelsis deo:
Gaudeamus.
Gloria in excelsis deo:
Gaudeamus.
Leave we all this wearldly mirth,
And follow we this joyful birth;
Transeamus.
And follow we this joyful birth;
Transeamus.
Alleluia, res miranda,
Pares forma, gaudeamus,
Transeamus.
Pares forma, gaudeamus,
Transeamus.