In the 15th century, Florence became a center of artistic attraction and was often called the "new Athens." Artists from all over Europe, including philosophers, musicians, painters, and architects, flocked to the city. Heinrich Isaac, an up-and-coming singer and composer, began his career in Florence with the support of Lorenzo de' Medici, the city's true power broker. As the singer of San Giovanni, Isaac was involved not only in the liturgy but also in other areas.
The work O decus ecclesiae exemplifies the diversity of his musical output. The close relationship between Lorenzo and Isaac led to Isaac composing pieces such as Quis dabit pacem populo timenti? after Lorenzo's death. Lorenzo's death ushered in a period of uncertainty in Florence, prompting Isaac to take on new responsibilities at the court of Emperor Maximilian I in Vienna and Innsbruck.
At the imperial court, Isaac's primary responsibility was to provide the court chapel with a wide variety of liturgical works. It was in this environment that Isaac composed the important six-part Missa Wohlauff gut Gsell von hinnen, which he masterfully crafted and which is considered a remarkable highlight of his oeuvre.
His musical legacy continued after his death; this is evident in four motets that were only preserved posthumously. These compositions, based on Gregorian cantus firmi, reflect Isaac's lasting influence on the liturgical music of the early 16th century. Rooted in this tradition, they remain to this day as impressive testaments to his artistry.