Born in Westerly, Rhode Island and raised in nearby Hope Valley, Billy began singing as a child and first performed in public at age 7. He first gained notice at age 11 when his first single, "One Voice", became a top 20 hit on the BIllboard Hot Country Songs chart, making him the youngest to acheive that feat. He released a total of five albums with one going double platnuim and two going gold. However, once he hit puberty, Billy's voice changed, causing him to withdraw from music though he would later return after working on his voice.
Billy came out as gay in 2014. He made the announcement on YouTube.
Billy tried out for season 11 in 2016 and wowed the coaches with his take on the Adele hit "When We Were Young". Once he introduced himself, both Blake Shelton and Miley Cyrus recognized him from when he had been a country star as a kid. After listening to what all four coaches had to say, Billy choose Adam Levine, who had turned around first, as his coach.
Billy progressed through both the Battle and Knockout rounds to make it to the top 12. He was considered a strong favorite to win but finished second to Team Blake's Sundance Head on December 13, 2016.