stopped reminding him just which one of them had sold more records." Sheeran affirmed that people did not expect that kind of song from him and are surprised when they listen to it. Mars said it was a "privilege" working with Sheeran and Stapleton saying, "You never know what you're gonna land on when you collaborate with other musicians". He had fun working on the song with them, as did Sheeran. Production and release "Blow" was written by Sheeran, Stapleton, Mars, Brody Brown, Frank Rogers, J.T. Cure, Bard McNamee and Gregory McKee. Mars not only handled the production, but he also played the guitar, drums and the moog, while Brown played the bass. Charles Moniz and Joe Rubel, with engineering assistant Jacob "The Menace" Dennis, engineered the song. The track was mixed by Manny Marroquin at Larrabee Sound Studios, Los Angeles, with Chris Galland serving as a mixing engineer assisted by Robin Florent and Scott Desmarais. It was mastered by Stuart Hawkes at Metropolis Mastering in London. "Blow" premiered on 5 July 2019, on Australian radio station KIIS 106.5. Atlantic and Asylum Records released the song on the same day, along with Sheeran and Yebba's "Best Part of Me" (2019), to digital download and streaming services in various countries. Atlantic released the single on 8 July 2019, to several radio formats including active rock, contemporary hit radio and Hot AC radio stations in the United States. On 10 July 2019, the single was re-released to active rock. Composition "Blow" is a rock, blues rock and hard rock song. It features a "chunky-fun" 80s heavy-metal "distorted electric guitar riff". The screeching guitar is accompanied by a lively drumbeat which "bounce[s] off [the] ears" and an extended shouted high note. "Blow" is an upbeat track, composed in the key of E-flat minor with a tempo of 92 beats per minute. The singers' vocal ranges span from the a low note of B4 to a high note of E6. They showcase "Stapleton's familiar howl, a soulful Mars", as well as an uncommon "rough-around-the-edges" Sheeran. AllMusic's Stephen Thomas Erlewine and Slant Magazine Seth Wilson, respectively, found the single to be loud and crazy; Erlewine described it as a "churning rocker". In the same vein, Alexis Petridis of The Guardian compared its energy to a mix of Led Zeppelin with Queens of the Stone Age. Sarah Murphy of Exclaim! called "Blow" a strange fusion of