This article investigates the methods of elaboration used in making organum at the cathedral of Notre-Dame in Paris during the twelfth and thirteenth centuries. Its aim is to show how and why tripla and quadrupla came to be composed as an expression of their cultural context and to investigate conditions determining the elaboration of these virtuosic pieces destined for the celebration of the greatest feasts in the new cathedral.

Four compositions in the first layer of the Old Hall Manuscript (GB-Lbl, Add. MS 57950) are attributed to R. Chirbury (or R. Chyrbury). This article argues that the Robert Chirbury who ended his days as Dean at the Collegiate Church of St Mary, Warwick was this composer. His career included stints at the Chapel Royal and probably also earlier employment in the London diocese, as well as service in the household of Richard Beauchamp, Earl of Warwick. Moreover, this individual can be differentiated from similarly named men in the Register of the London St Nicholas Fraternity of Parish Clerks, and the assertion that the composer was employed at St George's, Windsor can be discounted.

This article discusses the implications of a new fragmentary manuscript of fifteenth-century polyphony on musicians' biographies, the dating of other manuscripts, and the cultural ties between Venice and the two great Tuscan powers of Florence and Siena. This parchment fragment recovered from a Sienese archival binding represents the earliest surviving concordance between the music of the two Tuscan rivals. It once stood in a Tuscan collection of Holy Week polyphony, including the Lamentations of Jeremiah as set by the Venetian composer Johannes de Quadris; it may have originally been the property of a contado parish church or monastery. The specific musical text of the Siena fragment also can shed new light upon the dating and musical transmission of two contemporary Florentine manuscripts (I-Fn II.I.350 and I-Fd 21), containing music of Brumel, Carpentras and Bernardo Pisano. Finally, the rare Tuscan concordance can begin to clarify some of the earliest known traffic in polyphony between Tuscany and distant Venice.

Liturgical chant bibliography 15 maintains the previously established subdivisions: (1) Editions and facsimile editions, (2) Books and reprints, (3) Congress reports, (4) Chant journals, (5) Collections of essays and dictionaries, (6) Articles in periodicals and Festschriften. Additions to previous bibliographies, for the most part reviews, precede the current bibliography.