Billboard’s decade-end recaps encompass chart performance from Dec. 5, 2009, through Sept. 28, 2019 (except for those for the Social 50, which began on Dec. 11, 2010, and Hot Dance/Electronic Songs and Streaming Songs, each of which launched Jan. 26, 2013, as well as for Touring; see below).
On the decade-end Hot Songs and Top Albums recaps, titles are ranked based on an inverse point system, with weeks at No. 1 on weekly charts earning the greatest value and weeks at lower positions earning the least. Due to changes in chart methodology and title turnover rates during the decade, certain periods were weighted differently.
Top Artists recaps are ranked based on a formula blending performance, as outlined above, of all their chart entries. Specifically, the overall Top Artists category…