Couch began in 2019 as a Boston-based retro pop group, who were forced to write and record their songs over Zoom during the pandemic. The seven-member band performed on stage together for the first time in 2021, and since then have sold out shows in both the U.S. and Europe. Their debut album, “Big Talk,” comes out on Oct. 24, followed by a 40-city international headline tour. In their TV debut, here’s Couch with “On the Wire.”