* Darkness: This refers to the quality of being dark, not a physical thing.
* Theater: While a theater is a physical place, the word "theater" in this context refers to the concept of a place for performance.
* Movie: Similar to theater, "movie" refers to the concept of a film, not a specific object.
* Music: This is the abstract concept of sound organized in a particular way.
* Mood: This refers to an emotional state or atmosphere, a non-physical concept.
Therefore, the abstract nouns in the sentence are: darkness, theater, movie, music, and mood.