Layering pitch-perfect three-part harmonies over soulful pop, funky folk and stadium rock channeled through an R&B lens, the Shadowboxers—original members Adam Hoffman (vocals and guitar), Matt Lipkins (vocals and keys) and Scott Tyler (vocals and guitar) with Cole McSween (drums) and Carlos Enamorado (bass)—have been winning over fans with their fun-loving, captivating live performances since forming in college seven years ago in Atlanta. But first they won over Indigo Girls’ Emily Saliers, who’d caught one of their shows at Emory University, which led to the Shadowboxers (above, playing “Build the Beat” for WRLT FM) touring and performing with Indigo Girls. Now based in Nashville, Tenn., the group’s Kickstarter-funded Red Room arrived in 2013. To thank donors, the band recorded several cover songs and posted them to their YouTube channel. Their version of “Pusher Love Girl” so impressed Justin Timberlake that he’s since taken them under his wing and signed them to Villa 40, his artist-development company. Following the release of several singles, including “Hot Damn,” and with a new album on the horizon, the Shadowboxers, who have been compared to the Temptations and Maroon 5, have hit the road. Their November tour brings them to Music Hall of Williamsburg on Friday (with Blonde Maze opening) and The Bowery Ballroom on Saturday (with the Rooks opening).