Pope Saint Gregory I, also known as the Great, was the Pope of the Catholic Church between 590 and 604 AD. Pope Gregory was famous for the emphasis he put on missionary work. He sent many people out to bring people to Jesus and into the Church. Anglo-Saxon Britain was, at that time, still on the frontier of Christendom.
Pope Gregory may have also established "cantus planus," known in English as plainchant. Most today know this style of singing as Gregorian Chant. The melodious, monophonic music is known throughout the Church and closely associated with medieval monasteries. Gregorian chant gives us the oldest music we still have in the original form, some dating to the centuries just after the death of Gregory.
He is the patron saint of musicians, singers, students, and teachers.