Explain briefly how analyzing and comparing the two beethoven pieces and the mozart piece are music theory in ‘real life.’

The Beetoven pieces and Mozart pieces are like the "shake it off" these days. Unlike some composers these composers were very popular and I may be hard to tell but Mozart used to be Katy Perry (joke because they both have weird hair.

Idon't inderstandhthe question

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.