Concerning the question of De musica sacra and other decrees of the SCR, I have in front of me The Celebration of Mass: A Study of the Rubrics of the Roman Missal, 4th ed, "revised throughout in accordance with … the typical edition of the Roman Missal (1962) by the Rev JB O'Connell (1964). In the foreword to the fourth edition, he mentions the 1962 typical edition and new decisions from the SCR as reasons for the new edition. In his sources he includes the decrees of the SCR (1588–1926), the Acta Apostolicae Sedis (1909-1962) [in which SCR decrees were later published), and by name Instructio de Musica Sacra et Sacra Liturgia (S.R.C., 3 September, 1958).