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It’s a big St. Patrick’s Day morning and Turnover Tuesday at the (properly functioning) iTunes Store for Aftermath/Interscope’s Kendrick Lamar and Epic’s Modest Mouse, whose newly released albums proudly represent the hip-hop and rock contingents. The singles leaderboard, by contrast, is relatively static, as late-comers continue to discover “Uptown Funk” and the twin smashes from 50 Shades.