Classical music
Dimitris gets very angry when I don't open the door for him to get out of the room. Somtimes he accepts the situation when I give him small car, but that doesn't always work. Usually he tries to get me up from wherever he sees me sitting.
Yesterday I decides to try some music. I put on relaxing classical music with a flute, expecting him to get more angry, but instead he immediately calmed down and stopped crying! He started again as soon as the first 'song' was finished, to stop once more when the second one started. It was really amazing!