Q: "Nightclub scene with disc jockey playing music to dance by." Does this mean that "A dj is playing music."?
A: yes

Q: "Two men playing a board game in the living room." Does this mean that "Two nice men are playing a board game at home."?
A: yes

Q: "A guy in a plaid shirt and jeans is singing into a microphone while another guy in a black t-shirt, jeans and all-black converse shoes sits next to him on a stool playing guitar." Does this mean that "a man is singing"?
A: yes

Q: "A man excitedly pushing in lawn mower in the backyard of a house." Does this mean that "The man is watering his plants."?
A:
no