Superstar country-pop duo Sugarland — vocalist Jennifer Nettles and guitarist Kristian Bush — bring their Incredible Machine Tour 2011 to the Coliseum this weekend in support of their latest album, The Incredible Machine. The Grammy-winning act first found success as a trio in 2004 with the debut Twice the Speed of Life. The follow-up collections — Enjoy the Ride (2006), Love on the Inside (2008), and Gold and Green (2009) — were smashes as well. Nettles and Bush recently won Best Vocal Duo at the Country Music Awards. Their new 11-song collection features the hit single “Stuck Like Glue.” Their last local concert was an outdoor gig at the Family Circle Cup Tennis Center in the spring of 2009. They headline the Coliseum on Friday with support from Little Big Town.