The mood of Top 40 pop songs has turned sadder over the past 5 decades, according to a study of tempos and major/minor keys by Glenn Schellenberg, professor of psychology and music at the University of Toronto. His results are charted below by John Keefe of WNYC in New York. Blue indicates songs in minor keys; the left axis marks tempo in beats per minute. [via Studio360]
This animated chart, from digital music news, shows strikingly the changing contribution of vinyl LPs, CDs and other formats to music industry profits over the past 30 years.