While leaving my girlfriends work with ourselves, another bar tender, and a security guy we heard what sounded like a loud helicopter coming in from the south. mind you none of had drank and were not intoxicated. when the sound got closer we saw three lights. there was one light at the front and two lights at the rear. the two lights at the rear we very close to eachother, possibly 10 feet apart. the two lights and the front light were separated by about 150ft. you could not make out any sort of hull to the craft, it appeared to be blended into the sky, it was a nice night last night and you could see a few planets. the sound changed from that of approaching helicopter to a louder static like ringing sound. not so loud that its piercing your ears, but loud enough, and it seemed to kind of contain the sound with itself as it went. we were two streets south of lake erie and the craft was traveling towards the lake slow and low. although you could not make out the craft due to some sort of cloak, it did appear to give off a sort of cigar like shape. i have to add that there were no wing indicator lights. these were not drones either nor a blimp.