The track is the Canadian rockers' initial entry on the list, making them the first chart-topping rookie act since Bad Wolves last year.

The Glorious Sons ring in the new year with their first No. 1 on a U.S. Billboard chart, as "S.O.S. (Sawed Off Shotgun)" blasts its way to the top of the Mainstream Rock Songs airplay list dated Jan. 19.

"S.O.S." rises 2-1 to become the band's first leader on a tally powered by U.S. data after the Ontario-based act previously led charts in Canada.

The quintet reigns with its first entry on Mainstream Rock Songs, becoming the first act to lead the list with a maiden title since Bad Wolves, whose cover of The Cranberries' "Zombie" reached No. 1 in May 2018.

"S.O.S." concurrently climbs 30-28 on the Alternative Songs airplay chart, where it's the band's first top 30 effort, following the No. 32 peak of "Everything Is Alright" a year earlier (Jan. 13, 2018). On the all-rock-format Rock Airplay ranking, "S.O.S." holds at its No. 7 peak, with 6.4 million audience impressions, according to Nielsen Music.

The song is the second single from Young Beauties and Fools, The Glorious Sons' second studio album, released in October 2017. Last year, the LP won the rock album of the year Juno Award.