Hard Rock Albums Chart
The ''Billboard'' charts tabulate the relative weekly popularity of songs and albums in the United States and elsewhere. The results are published in '' Billboard'' magazine. ''Billboard'' biz, the online extension of the ''Billboard'' charts, provides additional weekly charts, as well as year-end charts. The two most important charts are the ''Billboard'' Hot 100 for songs and ''Billboard'' 200 for albums, and other charts may be dedicated to a specific genre such as R&B, country, or rock, or they may cover all genres. The charts can be ranked according to sales, streams, or airplay, and for main song charts such as the Hot 100 song chart, all three data are used to compile the charts. For the ''Billboard'' 200 album chart, streams and track sales are included in addition to album sales. The weekly sales and streams charts are monitored on a Friday-to-Thursday cycle since July 2015; previously it was on a Monday-to-Sunday cycle. Radio airplay song charts, however, follow ...
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