Which of the following artists was a post impressionist artist who often painted scenes in nightclubs in theaters ?

One of the artist impressionist artist what often painted scenes in nightclubs & in theaters would be : Henri de Toulouse
He often used a Barmaid as the main object of his paintings or beautiful women who watched theater's show

hope this helps

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.