BIpolar surely takes a lot of inspiration from many different sources. This time the title references indigenous Australians. But we think BIpolar uses the word 'boomerang' in a metaphorical sense: as something that comes back, even if you can not predict it or if you are unaware of it.
BIpolar uses this term instead of 'music'. We believe the author wants to say that sounds are everywhere around us and there is no place on Earth where we can be without any sound. But do not worry - it does not mean that we live in an environment full of noise. There are a lot of peaceful tunes. For example this calm track, which is available on the following websites: