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Letter On Sacred Music in the Liturgy

Abbreviation	Title		Author	Year
TLS	Tra le Sollecitudini: On the Restoration of Sacred Music	Motu Proprio	Pope St. Pius X	1903
MD	Mediator Dei	Encyclical	Pope Pius XII	1947
MSD	Musicae Sacrae Disciplina	Encyclical	Pope Pius XII	1955
1958Inst	De musica sacra et sacra liturgia: Instruction on Sacred Music and Sacred Liturgy	Instruction	Sacred Congregation of Rites	1958
SC	Sacrosanctum Concilium: Constitution on the Sacred Liturgy	Constitution	Second Vatican Council	1963
MS	Musicam Sacram	Instruction	Sacred Congregation of Rites	1967
DD	Dies Domini	Apostolic letter	Pope John Paul II	1988
	Letter to Artists	Letter	Pope John Paul II	1999
	Liturgiam Authenticam: On the Use of the Vernacular Languages in the Publication of the Books of the Roman Liturgy	Instruction	Congregation for Divine Worship and the Discipline of the Sacraments	2001
	Directory on Popular Piety and the Liturgy		Congregation for Divine Worship and the Discipline of the Sacraments	2001
GIRM	General Instruction of the Roman Missal		Congregation for Divine Worship and the Discipline of the Sacraments	2002
	Chirograph for the Centenary of the Motu Proprio Tra le Sollecitudini on Sacred Music		Pope John Paul II	2003
	Ecclesia de Eucharistia	Encyclical	Pope John Paul II	2003
	Redemptionis Sacramentum: On Certain Matters to be Observed or Avoided Regarding the Most Holy Eucharist	Instruction	Congregation for Divine Worship and the Discipline of the Sacraments	2004
	Sacramentum Caritatis	Apostolic exhortation	Pope Benedict XVI	2007
	Summorum Pontificum	Motu proprio	Pope Benedict XVI	2007
	Letter to Bishops on the Publication of the Motu Proprio Summorum Pontificum	Letter	Pope Benedict XVI	2007
	Sing to the Lord: Music in Divine Worship		US Conference of Catholic Bishops	2007

http://www.vatican.va/archive/hist_councils/ii_vatican_council/documents/vat-ii_instr_19670305_musicam-sacram_en.html

Other writings on Sacred Music:
Joseph Cardinal Ratzinger, “In the Presence of the Angels I Will Sing Your Praise,” The Regensburg Tradition and the Reform of the Liturgy, 1996.
Pope John Paul II, Address to Bishops of the United States on Active Participation in the Liturgy, 1998.
Pope Benedict XVI, remarks at the blessing of the new organ of the “Alte Kapelle” at Regensburg, 2006.