Guns N’ Roses are back on stage with a world tour that kicked off on Saturday (March 28) at the Tecate Pa’l Norte festival in Monterrey, Mexico. There, the veteran hard rock band led by Axl Rose, Slash and Duff McKagan performed for the first time their two new singles “Nothin’” and “Atlas” — a couple of lost gems from their 2008 album *Chinese Democracy*. “It’s good to see you,” vocalist Axl Rose greeted the crowd in English at the Parque Fundidora in the border city, which had an estimated attendance of 100,000 people, according to the festival organizers. The American band’s performance, on the second day of the 14th edition of Tecate, opened with the 1987 classic “Welcome to the Jungle,” followed by a handful of songs that have captivated generations, such as “Mr.…