I like this idea. If implemented, it would make sense to me if it was close to the location of an artist's chart ranking on their individual pages.
On a tagent but related to charts, why do you label the rankings of the Top 100 artists yet when you click to view this chart, it only shows up to #20. This makes zero sense to me. Either remove labels on artist pages above #20 or extend the chart, but don't have this halfway house that is frustratingly incomplete statistical information.