Under which category of experiencing music would this example belong? researching the time period in which a piece of music was written responding to music listening to music exploring music participating in music

It would have to be  researching the time period

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.

Ihave no idea what are some of the examples