But there’s no star big enough to permanently stop gravity. Now that Jackson sales have come back to earth, Sony reports that last quarter’s sales dropped another 10.8 percent, or a mere 6 percent if you strip out the effect of currency fluctuations. Operating income dropped 6.1 percent. Reminder: Digital music sales, which were eventually supposed to overtake physical sales and push revenue back up once again, aren’t doing the trick. In the U.S., sales via Apple’s iTunes and other outlets are either flat or shrinking, depending on the sales data you’re looking at.