Task: Question Answering
Input (English): Passage: My friend and I decided we wanted to go dancing . We decided to go dancing at night . Once it got dark outside , I changed into comfortable clothes and shoes and met my friend . We walked to a nightclub . When we arrived , we waited in line to enter . Once inside , we made our way to the center of the dance floor and waited for the music to begin . There was a DJ in charge of selecting and playing music . The DJ began to play popular songs . I danced with my friend . Many people were dancing at the same time . The dance floor was crowded and hot . Everyone was sweaty and having a lot of fun . After we had danced for many songs , we got tired and decided to leave . Question: When did they twist their shoulders in tune to the music? Option1: before they arrived Option2: after the music began
Output (English): after the music began