1340–1400; one piece, number 118, is clearly of later date, and numbers 115–117 may also be somewhat later than most of the others. The geographical origin of the manuscript is equally uncertain; it is thought to be either Tuscany or Umbria. The titles of two of the instrumental pieces, "Isabella" and "Principio di virtù", may suggest a connection to Perugia, which was ruled between 1400 and 1402 by Gian Galeazzo Visconti; Visconti was, through his marriage to Isabella, Countess of Vertus, the comte de Vertus, or, in Italian, the Conte di Virtù. However Visconti was also Duke of Milan, and the manuscript may thus be connected with that city. The works Add MS 29987 contains 119 pieces of music; however, three of them are copied twice, so there are 116 different pieces. Of these, 45 are ballate, 35 or 36 (if a fragment is counted) are madrigals, 15 are instrumental pieces under the general title of "istampitta" or estampie, 8 are cacce and 3 are virelais. There are also a motet and a "Chançonete tedesce" or canzonetta tedesca, and 7 liturgical works, kyrie, gloria, credo, antiphon, two sequences and a hymn; the last piece is untexted, but may be a madrigal. Forty-three of the pieces, including all the instrumental works, are unica. Eighty-two of the pieces, all but one of them polyphonic, can be attributed to their composers, either because the composer's name is given in the manuscript or by comparison with other sources. Half of these are by either Francesco Landini (29) or Niccolò da Perugia (12 and a fragment). There are seven works by Jacopo da Bologna, five by each of Bartolino da Padova, Giovanni da Cascia and Lorenzo da Firenze, and three by each of Bonaiuto Corsini, Donato da Cascia, Gherardello da Firenze and Vincenzo da Rimini. Andrea da Firenze, Jacopo Pianelaio da Firenze, Paolo da Firenze, Rosso de Collegrana and Thomas de Celano are each represented by a single piece. There is one ballata by Guglielmus and Egidius de Francia, and a madrigal by Guglielmus alone. List of contents of the manuscript The 119 pieces in the manuscript are: Recordings The following discs contain some of the instrumental dances found in this manuscript: Landini e la musica fiorentina – Secolo XIV, Ensemble Micrologus, dir. Patrizia Bovi (Opus 111, OP 30 112) Istampitta – Musiques de fête à la cour des Visconti en Italie à la fin