For centuries the first reading [of Good Friday] had been the prophecy of Hosea about the three days of death and resuscitation, while in the second a section from Exodus about the sacrifice of the Paschal Lamb was read. Attached to the first reading was one of the most important chants of the Christian liturgies, i.e. the canticle Domine audivi, whereas the second reading was followed by Psalm 139 of the persecuted Messiah. Both were sung in tract form which bears evidence of the ancientness of the custom on the one hand, and suits excellently the mood of the exceptional liturgical situation, on the other.
In fact, this is not the moment when the responsorial chant of the faithful is by all means necessary and desirable. These texts — the words of the Church as she falls on her knees stunned by God’s powerful deed in the first tract, and the complaint of the Body of Christ united with its suffering Head in the second — can well-nigh dumbfound the community listening with attention to the words performed by a solo singer or a small choir. These readings and tracts can be found unchanged in every liturgical book of the Roman rite (the Tridentine rite included), differences appear only in the rituals of the non-Roman churches (Beneventan, Milanese).
Laszlo Dobszay, The Bugnini-Liturgy and the Reform of the Reform (2003)