'The Voice' Star John Holiday Melts Coaches' Hearts Singing High Notes in Celine Dion Cover

Two mindblowing performances from "The Voice" contestants John Holiday and Cami Cune on Tuesday night's final Knockout Rounds left the judges stunned.

The 19th season of "The Voice" has already brought forth some incredible talents, but those on display on Tuesday night's final Knockout Rounds were out of this world.

Two incredible talents from coach John Legend's "Team Legend" took to the stage on the night, and after their performances, it was clear that the "All Of Me" crooner had saved the best for the night.

The first talent to hit the stage was the 20-year-old Cami Clune, a musical theatre student. Clune performed Screamin' Jay Hawkins' "I Put A Spell On You."

She delivered a hauntingly spare rendition of the song, leaving coach Kelly Clarkson on her feet. The judges cheered Clune after her performance but would not have expected what followed afterward.

John Holiday, who had watched Clune's performance, took to the stage to perform Celine Dion's cover of the iconic song, "All By Myself" by Eric Carmen.

The coaches were not new to Holiday's incredible vocal range as he had already thrilled them to his otherworldly sound, but his performance on the night was one to behold.

It proved a tough choice for him as he noted Holiday and Clune were both phenomenal talents.

The 35-year-old music professor struck all the notes perfectly before going on to hit the famous high belt Celine Dion pulled off in her version of the song, stunning all the coaches.

Coach Gwen Stefani joked she was retiring from music after what she just heard from Holiday. She added that she was blessed to be on the show and watch someone like and that the "Olympics" coming out of his mouth was crazy.

Clarkson said once she heard the key, she was shocked and knew the note would come at the end, adding that Holiday is a beautiful gift. Blake Shelton was also impressed by Holiday's performance.

He said he loves Holiday as a fan of music and the show. He also joked that he hated the latter because he was a constant pain to him. Holiday's coach, Legend, did not hold back in praising him.

Legend said none of the coaches had seen or heard anyone that sounds like Holiday on earth, adding that every choice he made was well thought out and wonderfully executed.

The coaches also reserved praise for Clune, with Kelly saying she was impressed by her and that she has continuously improved. Legend praised her natural style and flexibility, while Shelton hoped she would remain on the show.

It was time for Legend to choose between the two, and it proved a tough choice for him as he noted Holiday and Clune were both phenomenal talents and that he was grateful to work with them. The video ended on a cliffhanger just as he was about to announce his choice.

Holiday's performance on Tuesday night saw him continue with his impressive quality after he and another contestant, Julia Cooper, delivered one of the best battles in the show's history two weeks ago.

Meanwhile, Clarkson and Stefani were brought to tears on Monday night after two contestants from "Team Gwen," Carter Rubin, 14, and Chloé Hogan thrilled the coaches to another breathtaking performance.

When it was time for Stefani to choose between the contestants, she threatened to walk off as it was a tough decision for her to make.

Stefani ended up picking Rubin, while Legend used his coveted save to keep Hogan in the Live shows. "The Voice" returns next Monday and Tuesday at 8 p.m. PT/ET on NBC.