Two lights flying in random patterns over Nashville.Two lights appearing above clouds. Moving in random rapid patterns. Sometimes both appearing to fly together, then one would stop and very quickly shoot off in the opposite direction. I observed for 20 minutes. These were in the distance to the southwest. My son spotted them coming homr from work and called me. He said they appeared closest to him when he was near Harding Place an I-65. I thought they might have been spotlights, but the lights were coming from above not below. Not only was the pattern random, so was the speed, but generally they moved much faster than an airplane.