The tunes in this musical drama are mostly Indian, but they have been dragged out of their classic dignity; that which soared in the sky was taught to run on the earth.

To find out, Bowling and his colleagues first measured the distribution of tones in around 7500 western classical melodies and Finnish folk tunes in both major and minor keys.

Using data from RAJAR, a ratings agency, Enders Analysis calculates that the average 15- to 24-year-old radio listener tunes in for almost 20% fewer minutes now than five years ago.