There are currently no musical uses for the Amazon Kindle 3 reader. While this device is of course very high tech, its uses are pretty much limited to reading books.
There was a time when few people were DJs. That was when you had to pay to collect vinyls. Finding that rare record was a big deal.
It is hard to definitively say who was the first DJ or who was the first to invent Hip Hop music. As with so much about street and urban culture it is hard to separate myth from fact.