From the dub-reggae of the 60s, to the hip-hop explosion of the 80s, music sampling has been around for awhile. But its latest incarnation -- the mash-up -- wasn't familiar to most people until last month, when record label EMI ordered an L.A. producer to stop distributing copies of "The Grey Album," a digital combination of The Beatles' "White Album" and JZ's "Black Album." Still, as digital technology becomes more accessible, cracking down on mash-ups seems almost impossible. Reporter: Stacy Bond
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