Forbes contributors publish independent expert analyses and insights. Hugh McIntyre covers music, with a focus on the global charts.

Dale Stewart, the bassist for post-grunge veterans Seether, thinks there should be a calculation for “road years,” similar to the math surrounding dog years. “It’s like, how old are you in road years?

HUNTINGTON — Two decades ago, members of the rock band Seether left their homeland of South Africa and moved to the U.S. in search of a bigger audience for their hard-charging music. Now, 20 years ...