The Billboard Hot 100 is the music industry standard chart in the US that tracks the most popular singles across all genres weekly based on sales, radio airplay, and online streaming data collected by Nielsen Music. There is generally no linear correlation between a song's entry position on the chart and the total number of weeks it spends on the chart, indicating consumer tastes cannot be reliably predicted. While not very useful for consumers, the Hot 100 chart is very useful for the music industry in evaluating songs and sales.