Before I start with part two of this week's "chart sweeps" of the latest songs making their way on to the weekly music charts at Billboard magazine, I need to bring up what happened at the magazine this week . From the time that the chart gods started electronically monitoring what radio stations played in the early 90s until last week, the rock, R&B, Country, dance, and Latin subcharts were solely based on airplay, graphing a song's broadcast to a station's Neilsen rating to estimate an "audience impression" score, which would determine the ranking. With the advent of digital sales, I've been really interested in a revised chart that would take sales into account, since there are big hit songs (at the top of my head, "Goodbye Earl" at country) that didn't do as well on radio. Well Billboard did finally pull through with this, but in effect possibly neutered their whole chart system as a result. Instead of using the exist...