They really liked that the robot was enjoying the music.  And they didn't say the robot was moving to the music, they said "enjoying" the music.
로봇이 음악을 즐긴다는 것을 좋아하지요.  로봇이 음악에 맞춰 움직인다고 얘기하지 않고 음악을 즐기고 있다고 말하지요.