Music History Resources
http://www.slideshare.net/jpholly/periods-of-musical-history-25868032
The Origins of Music - The Story of Guido - Music History Crash Course
https://www.youtube.com/watch?v=l-JMX7tVqog&list=PLbOFSWsKn1a4ZdU4DqwBiA0Qq1FD0UJWc&index=17
https://www.youtube.com/watch?v=l-JMX7tVqog&list=PLbOFSWsKn1a4ZdU4DqwBiA0Qq1FD0UJWc&index=17