Jay Z may be selling out Yankee Stadium, but album sales are not that encouraging. The second week of sales for “Magna Carta Holy Grail” dropped 76% to 127,000 copies. That puts “MGHC” at not quite 500,00 for the first two weeks of retail sales. This doesn’t count the million copies sold to Samsung and given away free to their customers. No one knows how many customers took that bait. But since Samsung has not made any bold announcements, we can guess that the number was less than expected. If they had had a half million downloads they would have bragged about it. As it, I’ve asked and no one has responded. The $5 million paid by Samsung to Roc Nation is no doubt a hit within Jay Z’s world. But he may have siphoned off potential sales, and undermined his chart position. “MCHG” is number 1, but it will be toppled soon by any the of the coming new releases from Robin Thicke, John Mayer etc.