Temper City was founded in 2021 by singer-songwriter Eytan Peled and the production duo Sync (comprising Aviv Barenholtz and Chen Kordova). The three friends had previously collaborated successfully behind the scenes, writing songs for pop and EDM artists such as Zeds Dead, Dimitri Vegas, and Barns Courtney. Having already composed music together as a trio, they decided to transition their partnership into a band of their own. Their debut single, "Self Aware", was released on February 15, 2026, via the independent label Thirty Knot, following a teaser campaign on TikTok that began on January 28, 2026. The single went viral and entered the Billboard Hot 100 on April 18, 2026.