Strange flashing lights hovering and the sound of whales singing from all around me in the sky

What I really want to report are the sounds I heard for a short time while the craft was present. There was a strange craft that was only a few miles from the tree tops about 2 miles from me. It had strange flashing lights and kept hovering straight up and down. When it got very high in the sky, it would almost look like it was trying to mask itself as a star except that I could tell the lights were flashing and I had been following it since it was close to the tree tops. It kept going up and down and hoovering, and my attention was first brought to it by my dog and many other dogs in the neighborhood barking at it. I do live near naval bases and DC, so it could have been something military related. I did see at least one jet "flying dark" above my head with all its lights off except for a blinking red light. I cannot be sure of what the craft was except that it stayed in the sky for a very long time, but at a much higher altitude to mask itself as! a star maybe, but it's not part of our normal night sky. It seemed that it could mask itself to look like a star if no one really looked at it, knew that it isn't part of the night sky, or saw it at a lower altitude like I did. I felt like it might have been a form of camouflaging itself. I take all of that with a grain of salt. What I truly want to report about the incident is that at one point I walked outside and could hear what sounded like whales or dolphins speaking to each other from all around me in the sky. The sounds were not in any pattern or rhythm. It sounded organic and fluid, and it sounded like a beautiful conversation. It felt like it was all around me, just as if I were under water listening for the origin of a sound. The best I can describe it as the sound of whales singing songs, but in the sky. That lasted about 5 minutes. That part was roughly probably at about 11pm.