Johannes Franchois de Gemblaco

Johannes Franchois de Gemblaco was an active Franco-Flemish composer apparently active between around 1415 and 1430. All of his music survives in sources copied between 1425 and 1435, and none of his works appears to predate 1415, which places his style in the generation following Ciconia and Hugo de Lantins. His identification with a "Joh. Franciscus de Gemblaco" documented as succentor at the collegiate church of St Martin in Liège, in September 1417 and in 1419-1420, rests on a study by Quitin and was later endorsed by Igoe and Strohm.

The most widely held hypothesis, which identified him with the Burgundian court singer Johannes Franchois, documented between 1378 and 1415, is now considered highly implausible. That singer had been a canon of Évreux from 1394, so he could hardly have been the humble succentor of 1417-1420. As for his origins, the surname "de Gemblaco" was very common in Liège, so he may well have been born there rather than in Gembloux, a town in the Liège diocese but closer to Brussels.

His music shows the influence of Liège composers, especially Hugo de Lantins and Johannes Ciconia. Given the wide circulation of his works in Italian sources, he probably later moved south, as the text of his rondeau Sans oublyer in fact suggests. In the sources he appears as "Jo Franchois" or "Jo Gemblaco", and only twice with his full name, in the manuscript I-Bc Q15, where two settings of the Gloria are attributed to him. Stylistic consistency allows his entire output to be attributed to him with considerable confidence.

Among his most characteristic traits is systematic imitation: he often used several different modes for successive entries, following and extending a practice of Hugo de Lantins. He also made extensive use of motivic and sequential treatment, as well as careful expressiveness in the declamation of the text. His five-voice motet Ave virgo lux Maria is notable for its famous wordless introit, with two canonic voices above a broad "trumpetta", for placing the cantus firmus in the countertenor rather than the tenor, and for its extended unison imitation between the upper voices.

His legacy lies chiefly in the systematisation of imitation in the generation after Ciconia, an aspect that places him among the most innovative composers of his time. Although his biographical details remain uncertain, his surviving output, consisting of masses, motets and rondeaux, allows his contribution to the repertoire of the early fifteenth century to be reconstructed with confidence.