Does pop music exist? Hierarchical structure in phonographic markets

► Studied changes of weekly record sales (WRS) and correlations between 30 artists. ► Negative mean logarithmic change of WRS and correlations. ► PDF of logarithm of WRS changes has highly leptokurtic distribution. ► Mean-reverting process of record sales (H=0.39)-highest peaks in the first week. ► Minimal Spanning Tree for 30 artists reveals sectors belonging to music genres.