Sound waves are longitudinal waves..
for example
sound wave travelling in air is a example for longitudinal wave
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The article is about audible acoustic  waves.
                                          In physcis,sound is a vibration that propagates  as                       a typical  audible mechanical waves of pressure  and displcement  throught a median throught AIR or WATER. 
                      sound is a reciption of such waves and their precetion by the brain.

                                            - hope it will help you.
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very good
a wave of compression and rarefaction, by which sound is propagated in an elastic medium such as air.