(Reuters) Kanye West has increased his lead over 50 Cent in the much scrutinized battle between the rap stars, according to preliminary sales data issued Friday. West's "Graduation" had sold about 600,000 copies and 50 Cent's "Curtis" 430,000 copies, according to data reported to tracking firm SoundScan by eight leading accounts through close of business Thursday.
West's margin of 170,000 units marked an improvement on his first-day lead of 127,000 units. - more on this story
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