Country duo Sugarland joined pop artists like Andy Grammer, Luis Fonsi and Train’s Pat Monahan on American Idol on Monday, sharing the stage with the show’s contestants for a pair of duets in the Top 24 round. Appearing first with 16-year-old country singer Layla Spring, the duo’s Jennifer Nettles and Kristian Bush traded time on “Stuck Like Glue,” a sunny 2010 anthem to forever-young romance. Spring’s raspy vocals and bubbly stage antics stood out, and so did her effortless delivery of the song’s reggae-rapping bridge. Later on in the night, Nettles and Bush returned to sing “Stay” with vocal powerhouse and Pittsburg native Gabby Barrett, giving the emotionally complex cheater’s ballad a vibrant new spin. With stunning close harmonies that played Barrett’s brighter sound off Nettles’ deep-soul timbre, the rendition provided judges with a lot to like. Read more at RollingStone.com.