Hearing or seeing around corners is all about reflection. There are some corners you can't hear around, and some you can see around (mirrors would let you see an object, but ordinary walls will reflect scattered light).

However, there are also radio waves that are electromagnetic radiation at such long wavelengths that they can go THROUGH walls. Here's a question - how do radio wavelengths compare to those of sound? What note has the same wavelength as 89.7 WITR's FM signal at room temperature? :)

Yeah, I know sound waves are compression waves and that EMR waves are the other kind but forgot what it's called. Anyway... Waves of either kind have a period and a frequency. If there is a period and frequency, there is a wavelength. The doppler effect standing next to a highway would prove this: closing the distance decreases the apparent wavelength.