I was signalled to by a driver and passenger this evening.
On a rural road I was aware of a car behind me, I heard the bass notes of the "music". The engine note hinted the vehicle was slowing, and my internal alarm bell was beginning to sound as the said vehicle pulled along side but maintained a safe distance. I looked over to see the car window open and driver and passenger, two young ladies, waving and smiling broadly. I returned the wave with a smile as they sped off to look for someone younger but they brightened up a rather dull day for me.