I think that through decades we have all had our own versions of portable music, in fact listening to our favourite tunes has been around a lot longer than many people think with the very first consumer orientated portable transistor radio being produced in 1954! Therefore, we are looking at fifty seven years of portable music. But only recently with digital music a rift between the consumer, record companies and the law has occurred, despite changes to the laws and pressure on internet service providers the issue of downloading, copying and sharing digital music is yet to be agreed. This interesting info graphic shows how the music industry has grown due to the availability of portable music; let us hope that a solution that suits all is found quickly before all of this history is wasted.
Source [Test King]