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PopdustK-pop Chart Roundup: PSY's “Gentleman” Debuts at No. 1, Impacts Billboard ...PopdustPSY's “Gentleman” predictably rockets straight to No. 1 on this week's GAON singles chart, blocking R&B balladeer, K.Will, from the top spot. In last week's chart roundup, we predicted that K.Will might bag another chart-topper based off of strong ...