"Undocumented" tracks

Piracy: Average Teen Stores 842 Stolen Tracks on Their iPod: "In a recent study by British Music Rights, 14- to 24-year-olds were polled as to how much stolen music they carried around on a daily basis. The finding was that almost half of said music was never purchased. 842 of the 1,770 tracks held on the average digital music player were reported as stolen—that's 48 percent."