For questions relating to the magazine called "Billboard" and its weekly charts of top hits for various genres

Billboard Magazine is the purveyor of the list of the hottest singles and album releases for each week. If a band is "on the charts", it means that the band has made it to one of Billboard's lists. As such, when speaking of "Top-200" or "hottest" or anything of that nature, a person is generally speaking of where on Billboard's list that song/album appears.