After several weeks of low turnover in a row, the singles chart is more active, with 11 new arrivals in the Top 75 but no change at the top, where Mike Posner's I Took A Pill In Ibiza scores its fourth straight week at the summit. Sales of 75,710 in the week - including 41,084 from streams - lift its cumulative tally to more than half a million, although they are off 9.80% week-on-week, ending a run of 15 weeks ...