Harry Styles fans chant 5 Seconds of Summer song during Madison Square Garden shows

NEW YORK — Harry Styles fans are chanting the lyrics to a 5 Seconds of Summer song during his Madison Square Garden residency as a viral trend from TikTok takes over the concerts.

The audience has been singing the words to Telephone Busy by the Australian band during the instrumental break of Styles' song Ready, Steady, Go.

"Nothing makes me happier than knowing the harry x 5sos propaganda is spreading," TikTok user @tehedorothytehe wrote earlier this week in her concert video.

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In earlier Madison Square Garden sets in September, the 5 Seconds of Summer lyrics being chanted by the audience were barely audible.

But in newer videos from shows this week, it has become a veritable roar.

The trend started with a fan remix on TikTok.

User @millsberry75 posted a video in March mashing up the two songs, with 5 Seconds of Summer drummer Ashton Irwin talk-singing the intro of Telephone Busy over top of Ready, Steady, Go.

In August, 5 Seconds of Summer incorporated the remix into a popular DJ set they performed at Salt Shed Chicago during the Lollapalooza festival.

Now, fans are bringing it to the physical stage of Styles' tour.

A flood of videos on social media show fans jumping in on the trend.

Part of the excitement behind it comes from the history between One Direction, the English-Irish band where Styles first found fame, and 5 Seconds of Summer.

In 2012, One Direction member Louis Tomlinson shared one of their songs online, opening them up to a whole new audience.

The band was tapped to serve as opener for One Direction's worldwide Take Me Home tour in 2013, and later joined the boyband as a supporting act on their 2014 Where We Are tour.

More than a decade later, there is still a lot of crossover between fans.

In the age of manufactured trends, it is exciting to see a "natural" trend evolve from fans just celebrating a catchy tune, user @mariamontour said in an Oct. 6 TikTok.

"This fan chant that just started happening and progressively started getting louder is proof that the internet really can translate things into real-life trends, especially within fandoms" she said.

5 Seconds of Summer is well aware of the excitement around the two songs.

"I appreciate yall lol," Irwin commented in September on one fan's TikTok sharing her screaming the Telephone Busy lyrics at a Styles set.

The band has also reposted multiple fan videos of Styles' crowds chanting the song in the last week.

Styles himself has not directly acknowledged the trend yet.

Styles is 20 shows into a 30-show residency at Madison Square Garden in New York City as part of his tour.

There are still 10 more shows at Madison Square Garden alone, and more than 50 shows in the rest of the tour.

Styles will be performing four shows in May at Rogers Stadium.

"Everyone pls memorize this for toronto n2," user @bethanyannne wrote in a TikTok lipsyncing to the remix.

With files from CBC News