[4] In 1580 Vecchi was nominated by Charles Borromeo for the post of the newly created position of "maestro di cappella" at Santa Maria alla Scala, in good part because of the combination of his youth and training.
[4] In 1591 he applied for the position of mansionarius at Santa Maria alla Scala, in which he sang Ambrosian plainchant.
[7] His tenure at Santa Maria alla Scala returned the institution to its leading place among musical establishments in Milan.
[9] He is best known for his two collections of "sacred madrigals", La Donna vestita di sole (1590) and Scielta de Mardrigali (1604).
The second of these, published by his brother a year after his death, contains works borrowed from the secular madrigals of other composers, and modified into motets with Latin sacred texts substituting for the original lyrics.