Pictures at an Exhibition
Pictures at an Exhibition is a piano suite in ten movements, plus a recurring and varied Promenade theme, written in 1874, by Russian composer Modest Mussorgsky. It is a musical depiction of a tour of an exhibition of works by architect and painter Viktor Hartmann put on at the Imperial Academy of Arts in Saint Petersburg, following his sudden death in the previous year.
Source: Wikipedia — Pictures at an Exhibition (CC BY-SA 4.0)