DigitalDjigit
Honky Tonk Woman
While residential noise pollution in the 1980s was largely limited to barking dogs, airplanes, parties, and fireworks, the late 1990s and the emergence of hip hop and rap music brought a rapid escalation in the use of car stereos, many outfitted with powerful subwoofers that drive through walls hundreds of feet away. Furthermore, they are driven through residential neighborhoods at all hours.
Authorities have become concerned about loud car stereos for several reasons: they annoy some people, set off car alarms; and inhibit drivers' ability to hear emergency signals on the road. It is also widely reported that car stereos serve as a beacon for drug sales.
from http://en.wikipedia.org/wiki/Noise_pollution