Its disc "Spanish Plain-Song Works" (1988) presents, for the first time in the XX century, the fundamental works of Toledo rite's music -Intonarium Toletanum, 1516, Passionarium Toletanum, 1516- and the interpretation of rubrics belonging to this rite, plus the traditions of the Passion chant in Spain.

Its concert activity, developed in the most prestigious cycles and festivals of Ancient Music, always with unpublished programs in its own transcriptions, embraces the whole history of the Plain-Chant, both in its monodical construction, or in its liturgical alternation with Organ, Polyphony or Minstrels: for its monody version ransoms the medieval manuscripts of the Madrid National Library, using them it has structured almost all its setting ups, among them two Liturgical Dramas of the XI century; from the Codex Calixtinus (XII century) it transcripts and structures, as a musical first-fruit, a "Tropada" Mess for the Santiago Holiday.

In its interpretation of structures, with alternation, from works belonging to El Cancionero de Segovia, Antonio de Cabezón, Monteverdi, Victoria, Frescobaldi, Martín Coll ... it has been working with vocal and instrumental Groups specialised in this aesthetics: Pro Cantione Antiqua with Bruno Turner, Cor de Cambra Luis Milán from Valencia, the organist Jose Rada, the basoon-player Josep Borrás, the italian viola de gamba Quartet Laberynto with Paolo Pandolfo, Les Sacqueboutiers de Toulose, organiste Andrés Cea, the Ministriles de Marsias, the marine trombe Luis Delgado, flutes Jaime Muñoz, arm viole César Carazo and percusioniste David Mayoral.

Majority of its concerts have been recorded by Radio Clásica, a radio belonging to R.N.E., the organism that contacted the Group during two consecutive years (1992, 1993) to represent Spain in te "Special day of the European Union for Radiodifussion" (U.E.R.) The Group has recorded discs for RTVE, Hispavox, Decca and Sony-Music.

Its concert activity has been continuous, presenting programs with unpublished works that include the pure monody, the alteration with polyphony, with the organ and with the instrumental group.