See Billy Gilman's Stunning Celine Dion Cover on 'The Voice'

Gilman soars with "I Surrender," while Sundance Head reinterprets the Judds' "Love Can Build a Bridge"

Billy Gilman sings Celine Dion's "I Surrender" on 'The Voice.'

Though the Judds' "Love Can Build a Bridge," Loggins and Messina's "Danny's Song" and Céline Dion's "I Surrender" seemingly have little in common, The Voice's country contestants Billy Gilman, Sundance Head, and Josh Gallagher managed to tie them all together. With only eight contestants remaining in Season 11 of the NBC series, competition is heating up between the country performers, with each having a standout moment on the December 5th semifinals episode.

Perhaps the most remarkable of the three was Billy Gilman, who sang a poignant version of Céline Dion's "I Surrender." "We know you're gonna sing the crap out of it, but do it in a way that people can be let in," Coach Adam advised before his performance. And heed his coach's advice Gilman did – getting emotionally lost in the song with his effortlessly drawn-out, soaring notes. The row of coaches was equally dazzled: "We all know what he can do. . . but there was a moment amongst the coaches which I've never seen before – which was basically a look of shock and amazement and your ability to sing," said Coach Adam, before adding, "he's one of the most humble and hard-working guys I know, vote for him right now."

Directly before Gilman's knockout performance, Sundance Head tackled the Judds' imposing "Love Can Build a Bridge." With wailing guitar strings and an almost jazzy piano backing him up, Head showed just how captivating the sheer power of his gritty voice can be. "What can you say about Sundance anymore?" said Shelton. "It just blows my mind. Every week you come out here and you blow people away. You're not like anyone else in the world."

Meanwhile, Josh Gallagher's impassioned take on Loggins and Messina's "Danny's Song" was infused with hints of bluegrass and classic rock, the catchy chorus delivered in his distinctive twang. Gallagher also paired up with Head to sing Joe Cocker's "Feelin' Alright." Watch his performance of "Danny's Song" below.

The Voice airs again tonight at 8 p.m. ET on NBC with a performance by Blake Shelton and the announcement of the four finalists.