Answer:
The Notre Dame school trained a lot of famous singers in the Middle Ages. They were the first group of composers to bring Polyphony into the church. They cataloged a significant amount of music do that is why we know so much about music from the Middle Ages today.
Because when you start talking about your topic,you use to divide it,since it has to do with the 'topic',you don't use a period.
I believe this first symbol is a menorah. Hanukkah lamp) is a nine-branched candelabrum lit during the eight-day holiday of Hanukkah, as opposed to the seven-branched menorah used in the ancient Temple or as a symbol.
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