Chris Willman Senior Music Writer and Chief Music Critic For years, the radio world has looked to two different sets of radio charts — the Billboard rankings, which are currently powered by BDS, owned by Luminate (formerly known as Nielsen Music), and separate charts from the airplay monitoring service Mediabase. But that dueling-charts era is coming to an end. Luminate announced Thursday morning that, beginning in December 2022, use of BDS will cease and Luminate will begin partnering with Mediabase, which it says is “known widely as the music industry standard across labels, publishers and management companies,” for the charts published in Billboard. That will finally create an end to the confusion of whether a song has hit No. 1 on one or both charts in a given format. Of course, in the case of very close calls at the finish line, this will also mark the end of a time when songs had a shot of claiming a No. 1 at either Billboard or Mediabase.