Mann is no stranger to McKinley High and actually got his first break as a session singer for the show. The classical singer lent his voice to songs on episodes dedicated to Madonna and Lady Gaga before landing a role as an original member of The Warblers singing Katy Perry's "Teenage Dream" and "Hey Soul Sister" by Train.

"That was my first time being on set, seeing what it's like," Mann told Radio.com. "Besides it being incredible hard… it's so much fun, they're really like running around putting on a play. It's a blast."
Soon though he decided he didn't want to stand in the background forever (the 6-foot tall singer said he was put there because he was so much taller than everyone else) and decided to pursue his own career. A few years later, he earned a spot on The Voice as member of Team Christina and ended up finishing the competition in fourth place.