A1 x J1 (real names Phineas Waweru and Joshua Soremekun) are a British hip hop duo. They released their debut single "Latest Trends" in February 2021, which charted at number 2 in the UK and was remixed by Aitch and A Boogie wit da Hoodie. Their second single "Baby" featured British singer and rapper Deno. They were also featured on the deluxe edition of KSI's album All Over the Place, and on the debut single by British rapper SwitchOTR, as well as recording a song for the Plugged In series by Fumez the Engineer.