I found a list of the most illegally downloaded acts of 2013 today and found it very interesting. Clearly album sales are at an all time low. It is interesting to see that the most successful album sellers of 2013 are not necessarily the most pirated. For example One Direction are not at the very top but were among the top sellers of the year. I was also very surprised not to see Miley there. If anyone has any other articles or statistics I would love to see some more as I found this on Thatgrapejuice which doesn't specify if these figures are just albums or also including singles.