Gallus represented the
Counter-Reformation in Bohemia, mixing the polyphonic style of the High Renaissance
Franco-Flemish School with the style of the
Venetian School. His output was both sacred and secular, and hugely prolific: over 500 works have been attributed to him. Some are for large forces, with multiple choirs of up to 24 independent parts. '', published in his Opus Musicum II (1587). His most notable work is the four-part
Opus musicum (1586–1590), a collection of 374
motets that cover the liturgical needs of the entire ecclesiastical year. The motets were printed in the Prague printing house of
Georgius Nigrinus, which also published 16 of his 20 extant
masses. The motet
O magnum mysterium comes from the first volume (printed in 1586), which covers the period from the first Sunday of
Advent to the
Septuagesima. His motets show evidence of influence by the
Venetian polychoral style, with their use of the
coro spezzato technique. His wide-ranging, eclectic style blended archaism and modernity. He rarely used the
cantus firmus technique, preferring the then-new Venetian polychoral manner, yet he was equally conversant with earlier imitative techniques. Some of his
chromatic transitions foreshadowed the breakup of
modality; his five-voice motet
Mirabile mysterium contains chromaticism worthy of
Carlo Gesualdo. He enjoyed
word painting in the style of the
madrigal, yet he could write the simple
Ecce quomodo moritur justus later used by
George Frideric Handel in his funeral anthem
The Ways of Zion Do Mourn. His secular output, about 100 short pieces, was published in the collections
Harmoniae morales (Prague 1589 and 1590) and
Moralia (
Nuremberg 1596). Some of these works were madrigals in Latin, an unusual language for the form (most madrigals were in Italian); others were songs in German, and others were compositions in Latin. Critical editions of Gallus works have been prepared by
Edo Škulj and published by the
Research Centre of the Slovenian Academy of Sciences and Arts (ZRCSAZU). ==Commemoration==