For the past few nights now, I have been hearing strange sounds out nearby in town. I live in Medford, Oregon. The sounds I am hearing are like little xylophone beats, or you could describe it kind of like an error popup noise for windows xp. It beeps incrementally every few seconds, Sometimes it changes tones to a darker or higher pitched version. I really think it's some alien transmitter or something,
http://www.wikihow.com/React-when-There-Are-Strange-Noises-Outside