Many scholas are looking now to the Introit as a way of re-solemnizing the Mass, and it is an excellent place to begin. To use the proper text, ideally with the Gregorian melody, but suitably with other options, is a way of setting the right tone for the Mass at the very outset ...
Here is what the General Instruction says: "After the people have gathered, the Entrance chant begins as the priest enters with the deacon and ministers. The purpose of this chant is to open the celebration, foster the unity of those who have been gathered, introduce their thoughts to the mystery of the liturgical season or festivity, and accompany the procession of the priest and ministers."
And what music? The first and clearly most preferred option is the one deeply rooted in Roman Rite tradition: the antiphon and Psalm from the Roman Gradual.
The English text for the first Sunday of Lent is: "When he calls to me, I will answer him; I will rescue him and honor him; with long life will I satisfy him."
From the Gregorian Missal:
Let me say here again, just because people seem very confused, this is the normative ideal for both the old and new forms of the Roman Rite. This applies as to the 1962 Missal as to the 1970 Missal. This is not disputed as regards the 1962 Missal. But it remains true in the modern Missal as well. This chant belongs in the ordinary form, the Novus Ordo, the Mass of Paul VI, the Mass heard in 95% of Catholic settings in the English-speaking world, the current Missal after postconciliar reforms--please fill in any formulations I've left out. This is the entrance chant for the first Sunday in Lent.
From the Anglican Use Gradual: