It’s actually a rarity in the music business.
Have Guns N’ Roses fans lost their appetite for destruction?

That’s what some observers are wondering as the band’s 2016 reunion tour—which features Axl Rose, guitarist Slash, and bassist Duff McKagan together for the first time since 1993—has failed to sell out many dates.

Music fans have noted on Twitter, for instance, that the second night of a two-night run at at Soldier Field in Chicago last weekend was not well attended, though the first night was sold out.

In a report Thursday, the Wall Street Journal cited the fact that a recent show at Arrowhead Stadium in Kansas City, Mo. was attended by 27,000 concertgoers, a sizable amount, but far below the stadium’s 70,000-plus capacity.

Guns N’ Roses performance at the box office this summer underscores the difficulty that can be had packing these sorts of outdoor venues for musical events, according to the report. The tour’s promoter, Live Nation, told the Journal that it expects to sell more than 90% of the available tickets on the tour, with an average ticket price of $130. Some of the less well-attended shows were the result of the band playing cities it wanted to play, rather than sticking to the highest population centers that would better guarantee sellouts.

“The band wants to play certain cities,” including Kansas City, Bob Roux, co-president of U.S. concerts for tour promoter Live Nation told the Journal. “On virtually any tour we do, the larger cities generally outperform those with smaller populations.”

Fortune has reached out to Live Nation for further comment and will update the story if it responds.