explain which theme, region, and period a historian would focus on to learn about parisian music 100 years ago

The theme would be French culture, and more specifically, Parisian culture from 100 years ago. In culture, the historian would include not only music, but also paiting, theater, cinema, and so on.

The region would obviously be Paris, but also other regions of France, and even other countries, where Parisian music from the time might have had an influence.

And the period would be the first two or three decades of the XX century, which is the period that led to the development of Parisian music from 100 years ago.

the battle of the somme started on july 1st 1916. it lasted until november 1916. for many people, the battle of the somme was the battle that symbolized the horrors of warfare in world war 1.   the germans didn't use it on a large scale till 1915.

pan-africanism or pan-africanism is a political, philosophical, cultural and social movement that promotes african twinning, the defense of the rights of african people and the unity of africa under a single sovereign state, for all africans, both africa as of the african diasporas.