Describe and compare the O viridissima virga ("O Greenest Branch") by Hildegard of Bingen and the First Respond from Viderunt Omnes ("All the Ends of the Earth") by Léonin. Topics could include the historical or social context of each composition; the composers' background; and similarities and the use of musical elements such as sound, instrumentation, melody, rhythm/meter, harmony/tonality, and form. Note similarities as well as differences. Your submission should be in the range of 150–250 words. Refer to the Listening Journal Rubric for more information.