Hearing vs. Listening

Recently, it seems as if there are more ways to access music and sound than ever before. However, at the same time, though the amount of noise and music has increased there is no evidence that the amount of thoughtful listening people exhibit has increased as well.

What do you believe is the difference between hearing and listening? Can a person hear without listening? Does a person who cannot hear have the ability to listen? Support your answers with examples and/or reasoning