Making my way through a narrow alley I happened upon these two having what appeared to be some sort of dance party? A dance off? A comparison of rhythmic movements timed to changes in audio frequency? I asked why they would play the music out loud via a speaker and not just import the waveforms directly. The robot holding the speaker reached out and placed it against my chest; I felt the vibrations and thumping of the music. The robot withdrew the speaker and both continued their movements.