NASHVILLE, Tenn. — What started as a joke on Twitter about an unwritten rule among country radio stations not to play two female artists in a row prompted outrage by country music stars, but also pledges to give women equal airtime.

A now-deleted tweet by a Michigan radio station 98 WKCQ-FM last week claimed “we cannot play two females back to back” in response to a writer for Variety magazine. The station’s parent company later denied that was ever a rule, but the fire that had been steadily smoldering for years over the perceived barriers to women in country music had already been reignited.

Grammy-winning country singer Kacey Musgraves snapped back on Twitter to the station, “And yet, they can play 18 dudes who sound exactly the same back to back.”

Kelsea Ballerini chimed in to say, “I’m really sorry that in 2020, after YEARS of conversation of equal play, there are still some companies that make their stations play by these rules.”

But others took an immediate action.

CMT announced this week that they would institute equal airplay for female artists across their two channels. And a country radio station in Ontario, Canada, started an equal play initiative for one week, pledging to split the airplay time 50-50 between men and female voices.

The so-called rule against playing two women back to back is a familiar excuse heard by country singer Mickey Guyton, who was one of several female country stars tweeting about the controversy.

“I have also heard them say that women need to write better songs,” said Guyton, in an email interview with The Associated Press. Guyton said the industry is more concerned with finding reasons why women aren’t succeeding than finding solutions.

“For the longest time, I was so scared to speak up because I was taught to fear losing the support of the industry, but you can’t lose what you don’t have,” said Guyton, who has a new single called “Sister.” “The people who have felt underrepresented are thanking me for standing up for something that they have seen go on for a long time.”

“No women back to back” might not be a rule, but statistics show that overall country radio has put it in practice for the last two decades.

Jada Watson, a professor at the University of Ottawa who studies country music and gender, found that country radio has been for several years severely lopsided in how many female artists are played.

Her report, in consultation with WOMAN Nashville, found that between 2000 and 2018, there was a 66 percent decline in the number of songs by female artists on country radio.

“Ultimately what they’re doing with these 50/50 and equal play campaigns is retraining an audience to be familiar with female voices, who’ve they not heard for the last decade,” said Watson.