1. Backwards Bullets: This Week In Charts 1991

    December 01, 2009 4:05 PM EST 'THE LONG-AWAITED DAY HAS ARRIVED' read the headline in the "Hot 100 Singles Spotlight" column in the Billboard issue dated Nov. 30, 1991. Eighteen years ago this week, the Billboard Hot 100 transformed from a tally combining ranked airplay and sales reports submitted by…