1. Album, Rock Charts Celebrate Anniversaries

    March 23, 2010 1:05 PM EDT LONG PLAY: 54 years ago this week, the Billboard 200 began its storied history. In the issue dated March 24, 1956, the 10-position Best Selling Pop Albums survey appeared, marking the chart's launch on a weekly basis. Billboard had printed album rankings on an intermittent schedule as…