WEEKLY MARKETSHARE: A week ago, Robin Thicke’s chart-topping debut powered IGA to the top of the leaderboard; this week, The Civil Wars got the job done for Columbia. Computing this marketshare stuff isn’t that complicated, is it? But hold on, boys and girls—not everything is that straightforward, not in this nutty business. To wit, Now 47 is this week’s #2 album with a solid 83k, so where the heck is UMe, the releasing label? Not in the Top 10 at all. That’s because it goes to Capitol Music Group, home of the Now franchise, rather than the releasing label, which rotates from one hits collection to the next. Meaning that Now 47’s 83k, plus the 37k units moved by Prospect Park’s Caroline-distribbed Five Finger Death Punch in its second week, add up to enough sales to put CMG ahead of IGA by a nose. You’re welcome. (8/14a)