A musical notebook containing brief two-part musical sketches, which was rotated 180 degrees and re-used to record the baptism, marriage and burial records for the parish of Saint-Jean-Baptiste in Châtellerault, Vienne, France between the years 1540-1553. Although the notebook contains five ruled four-line staves from folio 21v through 54 (as currently numbered), music was only written on folios 51, 52 and 53, with a fifth line added to the staves on folios 51v-52v and 54. Folio 53v contains the chant Descendit de celis missus ab arce patris (Thursday, 4.Adv). The brief two-part sketches extend from 51v-52v, and are notated in beamed void fusae in groups of four against a slower line of void minims.

The music was likely written before 1540, since the earliest birth recorded in the register is 7 January 1540, pointing to the notebook being repurposed at that date. It is possible that the notebook was being used concurrently as both a vital register and musical sketchbook, each starting from one end of the book and working toward the center. In this case the music could have been written as late as 1550, since the 1551 death registers begin to overlap the musical sketches. The birth registers from February 1542 onward are written over pre-ruled blank staves, so, in all probability the notebook ceased to be used for any musical purpose around that time.