Music still sounds the same as ever - the strut and jive or hip hop, the rollicking passion of rock, the cool precision of jazz - but everything else is changing in a hurry. Digital technology has revolutionized how we listen, where we listen, how we collect and how we share it. The face of music has changed for good. The revolution is led by an astounding outburst of new technologies and products, from sleek portable digital music players to wireless home networking devices and online stores, like iTunes, that sell music one song at a time.