The Online Books Page

Gregorian chants

See also what's at Wikipedia, your library, or elsewhere.

• Catholic Church -- Liturgy
• Chants

• Gregorian chants -- History and criticism

• Chant (Plain, Gregorian, etc.)
• Chants (Plain, Gregorian, etc.)
• Franco-Roman chants
• Gregorian chant
• Old Roman chants
• Plainchant
• Plainchants
• Plainsong
• Roman chants

• A Textbook of Plainsong and Gregorian Music (London: Vincent Music Co., ca. 1906), by Francis Burgess (page images at HathiTrust)
• The Work of the Benedictines of Solesmes in the Plainsong Revival (London: Plainsong and Medieval Music Society, 1899), by H. B. Briggs (multiple formats at archive.org)

• Das Graduale Junta 1611: Ein Beitrag zur Choral-geschichte des 17. Jahrhunderts (dissertation in German; Fribourg, Switzerland: St. Paulus Druckerei, 1909), by C. H. Leineweber (page images at HathiTrust; US access only)
• Great Musicians (London: E. Grant Richards, 1908), by Ernest Oldmeadow (multiple formats at archive.org)

Items below (if any) are from related and broader terms.

• The Ceremonies of the Roman Rite Described (second edition, new impression; London: Burns Oates and Washbourne, 1920), by Adrian Fortescue, contrib. by Cardinal Bourne (multiple formats at archive.org)
• Constitution on the Sacred Liturgy (Sacrosanctum Concilium), Solemnly Promulgated by His Holiness Pope Paul VI, on December 4, 1963, by Vatican Council (2nd : 1962-1965 : Basilica di San Pietro in Vaticano) (HTML at the Vatican)
• Candles in the Roman Rite (third edition; Baltimore: A. Gross Candle Co., 1937), by Edwin Ryan, illust. by James R. Howard (page images at HathiTrust)
• The Holy Week Book, Compiled by Authority From the Roman Missal and Breviary, As Reformed by Order of Pope Pius X (pointed edition, with Mass texts in Latin and English; London: Burns, Oates and Washbourne, ca. 1913), by Catholic Church, contrib. by Adrian Fortescue
  • multiple formats at archive.org; some page corners obscured
  • page images at HathiTrust; US access only and some page corners obscured
• Liturgica Historica: Papers on the Liturgy and Religious Life of the Western Church (Oxford: At the Clarendon press, 1918), by Edmund Bishop
  • multiple formats at archive.org
  • page images at HathiTrust
• A History of the Mass and its Ceremonies in the Eastern and Western Church (fifteenth edition, c1879), by John O'Brien (multiple formats at archive.org)

• The Calendar of St. Willibrord, from Ms. Paris Lat. 10837: A Facsimile, With Transcription, Introduction, and Notes (calendar in Latin, commentary in English; Henry Bradshaw Society publication series v55; London: Harrison and Sons, 1918), ed. by H. A. Wilson, contrib. by Saint Willibrord (page images at HathiTrust)

• Christian Rite and Christian Drama in the Middle Ages: Essays in the Origin and Early History of Modern Drama (originally published 1965; open access edition Baltimore: Johns Hopkins University Press, 2019), by O. B. Hardison (HTML and PDF files with commentary at Project MUSE)

• Saint Edmund Campion Children's Missal (electronic edition of "Know Your Mass"; c1954), by Demetrius Manousos, illust. by Addison Burbank (PDF at ccwatershed.org)

• Worship (partial serial archives)
• Orate Fratres (full serial archives)

• The Gelasian Sacramentary: Liber Sacramentorum Romanae Ecclesiae (in Latin with English notes; Oxford: At the Clarendon Press, 1894), by Catholic Church, ed. by H. A. Wilson
  • multiple formats at Google; US access only
  • page images at HathiTrust
  • multiple formats at archive.org
• The Chapel Choir Book: A Collection of Catholic Music, Consisting of Masses, Anthems, Chants, and Hymns, To Which is Prefixed a Short Treatise on the Art of Singing (Boston: P. Donahoe, c1850), ed. by George W. Lloyd
  • multiple formats at Google
  • multiple formats at archive.org

• English Fragments From Latin Medieval Service-Books: With Two Coloured Facsimiles From Medieval Prymers (EETS extra series #90; London: Pub. for the Early English Text Society by K. Paul, Trench, Trübner and Co., 1903), ed. by Henry Littlehales (page images at HathiTrust; US access only)

• The Spirit of the Liturgy (c1935), by Romano Guardini, trans. by Ada Lane (HTML at EWTN)

• Book of Public Worship, for the Use of the New Church, Signified by the New Jerusalem in the Revelation, by New Jerusalem Church General Convention (page images at MOA)

• The Booke of Common Praier Noted (London, 1550), by Church of England and John Merbecke (frame- and JavaScript-dependent page images at rarebookroom.org)

• Les Chants Liturgiques de l'Eglise Arménienne (words in Armenian with English, French, and Italian translations; ca. 1877), by Armenian Church, ed. by Pietro Bianchini, contrib. by James Issaverdens (multiple formats at archive.org)
• Melodies of the Holy Apostolic Church of Armenia: The Liturgy, As Sung in Ordinary, During Lent, and on Festivals, Written Down in Modern Notation (second and enlarged edition, 3 volumes in Armenian and English; 1920), by Armenian Church, ed. by Amy Apcar (page images at HathiTrust; US access only)