Best-selling singles

A precise list of best-selling singles is hard to determine, as no organization has consistently tracked global music sales throughout history. Although the IFPI has published year-end global singles charts since 2007, it has never provided comprehensive all-time worldwide sales figures for singles. It is also difficult to compare the commercial performance of singles from different eras, due to shifts of music consumption over time. From the late 19th century to the early 2000s, physical singles were the major metric to measure a song's success. Digital downloads became the most dominant format between the mid-2000s and the mid-2010s, before being overtaken by music streaming.