A small number of superstars like Beyoncé and Taylor Swift is gobbling up an increasingly outsize share of concert-tour revenues, as music’s biggest acts dominate the business like never before.

Sixty percent of all concert-ticket revenue world-wide went to the top 1% of performers ranked by revenue in 2017, according to an analysis by Alan Krueger, a Princeton University economist. That’s more than double the 26% that the top acts took home in 1982.

Just...