[7][8] His debut album, also called One Voice was released on June 20, 2000, on Epic Records, and was certified double platinum in the United States.

The single "Oklahoma" was released on October 9, 2000, making it to the Billboard Hot Country Songs top 40 peaking at number 33.

[10] Gilman released a Christmas album in 2000 titled Classic Christmas which went gold,[11] followed on May 8, 2001, by his second album Dare to Dream,[1] which was certified gold, although its singles "Elisabeth" and "She's My Girl" both fell short of top 40 on the Billboard country singles charts peaking at numbers 50 and 56 respectively.

[6] After Dare to Dream, Gilman's voice began to noticeably change because of the onset of puberty, forcing him temporarily to withdraw from singing.

[9][12] His final album for Epic was released on April 15, 2003, and was entitled Music Through Heartsongs: Songs Based on the Poems of Mattie J.T.

The emotional introduction piece showed him with his supportive parents clearly introducing him as a child star and the fact that he had come out as gay in 2014.

Gilman impressed all four judges, Adam Levine, Miley Cyrus, Alicia Keys and Blake Shelton with his performance.

[16] In the battle round, Levine matched Gilman with teammate Andrew DeMuro both performing Michael Jackson's "Man in the Mirror" and opted for Gilman to stay for the knockouts round[17] where he confronted teammate Ponciano Seoane singing "Fight Song".

[18] In the inaugural live playoffs broadcast, he sang "Crying" from Roy Orbison and was one of two contestants from Team Adam to be saved by the public vote[19] the other being his teammate Josh Gallagher.

[27] In the final four broadcast on December 12, 2016, Gilman performed "My Way", a cover of Frank Sinatra, then performed "Bye Bye Love" from The Everly Brothers as a duet with his coach and mentor Adam Levine, to finish with his original, "Because of Me", which was originally going to be a Maroon 5 track, but Levine decided it would be an appropriate winner's song for Gilman.

[28] Closing the finale broadcast on December 13, Gilman became the season 11 runner-up when Sundance Head was declared the winner.

The track features vocals from Alan Jackson, Reba McEntire, Craig Morgan, Josh Turner, Kenny Rogers, LeAnn Rimes, Steve Holy, Kellie Pickler, Keith Urban, Wynonna Judd, Rodney Atkins, Amy Grant, Montgomery Gentry, Diamond Rio, Vince Gill, Richie McDonald, Ronnie Milsap and Randy Travis.

[38] In 2002, Gilman took part in a reading for the then Broadway-bound musical A Tale of Two Cities, in which he played "The Young Man", who is Madame DeFarge's brother.

[40] Gilman originated from Hope Valley, Rhode Island where he lived with his parents and his younger brother Colin as a young singer.

[43] He released his video titled "My Story by Billy Gilman" on One Voice Productions YouTube page only hours after another country singer Ty Herndon had come out.