Islam or the Mohammedan religion, and not Christianity, was the great influence.
Julius Cæsar (100–44 B.C.), the great Roman General, conquered Gallia (France), then invaded the land of the Teutons (Germany) and even reached England. In parts of northern Europe, one still sees the remains of great roadways, aqueducts or water works, and bridges, that the Romans built during their invasions.
In the Cluny Museum in Paris is a great hall built as a bath by the Romans. In Bath, England, the city was named for the ancient Roman baths still existing, and you can see the pipe lines which carried the water.
Dark Ages
The world at that time was not a happy place in which to live. There was constant warfare between the once powerful Roman Empire and these barbaric tribes. The poorest people were oppressed and many were slaves, bought and sold by the rich land owners and army leaders.
Into such a world was the child, Jesus, born—a world with little love for humanity, little unselfishness, little sympathy for the down-trodden and unhappy, few kind words for the poor or the sick, little justice and less mercy. No wonder that His teachings brought new life and gave hope to the people!
For several centuries following the birth of Christ, the world went through a period called the Dark Ages. Rome, the city of glorious victories and brilliant culture became the prey of the barbaric tribes—Huns, Goths, Visigoths, Vandals, Franks, Saxons, and Slavs,—until it seemed that civilization would be wiped out and people would become primitive again.
Music was saved during the Dark Ages through a small band of faithful followers of Jesus Christ, who founded a church in His name. That their music should have been made up of existing tunes and words is very natural. Jesus, himself, brought up in the religion of the Hebrews, often sang the Psalms of David. The beautiful traditional music of the Jewish synagogues found its way into the services of the early Christian Church, because many of the believers were Hebrews. Soon the Hebrew Bible texts were translated into Latin—the everyday language of the Romans, and as most of these early Christians lived in Rome, they followed the rules of music the Romans learned from the Greeks. So, our Church music was influenced both by the Hebrews and Greeks.
For about three hundred years the early Christians had to hold their services in secret, as they were punished even by death when caught, for not worshipping Jupiter and the Roman gods. They were not rich and influential, but just humble folk to whom the teachings of Jesus came as a joyous comfort. They had no beautiful palaces where they could hold services, and at the same time hide from the Roman centurions, so they worshipped in dark and secret places and could not have much music as it would have attracted the attention of their enemies. The early Christians shunned music, too, because it had been used for the wild dances and festivals of their pagan oppressors. As they were poor and uneducated, they had had little training and lacked money to buy instruments, so all in all music had a hard time to keep alive.
From what we can gather, they chanted their Psalms much as did the Hebrews and had responses which sounded like soft and monotonous droning.