Graphs and everything courtesy of a slashdotted article. Regular shuffle IS INDEED RANDOM and without duplicates – like shuffling a pack of cards and dealing them out. But the difference with party shuffle is that you get “with replacements”, i.e. each track in the list is chosen randomly from the selected playlist, like drawing a card from a full pack and putting it back again. Duplicates happen, and more often than our tiny un-stats friendly BRANES give credit for.