Mike Yung first captured the hearts of America's Got Talent viewers in 2017, when he made it to the semi-finals in season 12 after years of singing in New York City subway stations.Now, the crooner is back for season 2 of America's Got Talent: The Champions, and in the exclusive clip below, Yung blows the judges away with a powerful rendition of his 2018 Martin Garrix collab, "Dreamer.""I love this song! Great song," judge Heidi Klum exclaims over the crooner's rich, heartfelt vocals.