'The Voice' Sneak Peek: Watch 4-Chair-Turn Aaron Hines Harmonize With John Legend

Radha Rao had a performance, unlike any other Sunday night. Rao was playing the piano and singing “All of me” by John Legend outside Faneuil Hall in Boston when she noticed he was in the small crowd listening.

The Knockout Rounds are next on season 21 of “The Voice” — and Blake Shelton is already facing a “soul-crushing” decision!

— and Blake Shelton is already facing a «soul-crushing» decision!In ET's exclusive sneak peek at the Knockouts, which kick off on Monday, Team Blake's Hailey Green and Libianca take the stage to perform a song of their choosing, in an attempt to make it through to the season 21 live shows.Hailey kicks things off with a rocking rendition of Blake's own song, «God's Country,» earning massive praise from all of the coaches.«That was brave of you to sing the one and only Blake Shelton's song, right

Jem Aswad Senior Music EditorGrammy-nominated songwriter Ali Tamposi and artist-music industry vet Tamar Kaprelian have launched a new digital education video and podcast series “Song Start,” which is available on Spotify for Artists’ recently launched Noteable platform today — check it out here.The series debuts with ten video episodes with artists including John Legend, Camila Cabello, Charli XCX, and Phoebe Bridgers (pictured above), and ten corresponding podcast episodes explore and explain

BOSTON -- A street musician who performed a rendition of John Legend's hit “All of Me" in Boston over the weekend had one particularly appreciative audience member — John Legend.The Grammy Award winning singer was visiting Faneuil Hall with his family before his show Sunday night in Boston when he came across Radha Rao performing the hit song, The Boston Globe reported.Legend was impressed. He gave Rao a hug and a tip.Rao, 22, didn't recognize him at first.

season 21 is underway and the coaches are here to win!Following the Blind Audition rounds, Kelly Clarkson, John Legend, Blake Shelton, and new coach Ariana Grande are taking their teams to the Battle Rounds, pairing up their powerful performers for a coach's choice duet and making the tough decisions about who gets to move on to the Knockouts and who's going home. Each coach also has one save (for a member of their own team) and one steal (to use on another coach's eliminated singer) that they

— and the coaches are already eager to make their steals!In a sneak peek at the first battle of the night, Team Kelly's sibling trio, Girl Named Tom, and country singer Kinsey Rose team up to cover Eagles' arrangement of «Seven Bridges Road.»The four-part harmonies have the coaches stunned and Kelly Clarkson celebrating. «I'm so proud that you're on my team,» she raves to the group.

“The Voice” coaches were knocked out by this incredible audition.

's season 21 Blind Auditions — and that means it's time for the Battle Rounds to begin!On Tuesday night, viewers got a sneak peek at how the competition continues next week, when the coaches introduce their teams to their celebrity advisors — Jason Aldean for Team Kelly Clarkson, Kristin Chenoweth for Team Ariana Grande, Camila Cabello for Team John Legend and Dierks Bentley for Team Blake Shelton — and pair up their singers for a round of show-stopping duets.( fans will have to wait until the

— but when a singer like Aaron Hines takes the stage, everyone has to hit their button!On Tuesday, the San Antonio, Texas, native took the stage to impress the coaches with his cover of Giveon's «Heartbreak Anniversary,» earning one of the season's last four-chair turns.John Legend was the first to hit his button, and was quick to tell Aaron, «I love your voice.»«You just sounded like you knew what you wanted to do with the song,» he added.

The coaches’ teams are almost full on season 21 of “The Voice” — but when a singer like Aaron Hines takes the stage, everyone has to hit their button!

For someone known for his EGOT status, it may come as a surprise that a huge chunk of John Legend’s net worth comes from something other than his own work in the studio. The “All of Me” singer actually has his salary on The Voice to thank for a large portion of his net worth—but that wasn’t always the case.

Ariana Grande blocked John Legend during 'sseason 21 Blind Auditions — but it didn't quite go according to plan!During Monday's Blinds, Ariana said that John «pushed a button, literally and figuratively» when he blocked her to land showtune-loving crooner Joshua Vacanti last week.

, you know the competition was going to be fierce!In Monday's Blind Auditions, 17-year-old Carson Peters wowed the coaches with his cover of Don Williams' «Tulsa Time,» and the coaches prepared themselves for a battle with Blake Shelton to land the young singer from Piney Flats, Tennessee.«I heard a lot of Oklahoma references in that song,» John Legend began, noting that he was the first to turn his chair.

Chrissy Teigen and John Legend are spending the day together in NYC!

Chrissy Teigen wows in a sheer dress while she and husband John Legend head to a late night dinner at Carbone in New York City on Sunday night (September 26).

, you know the competition is going to be fierce!In a sneak peek from next Monday's Blind Auditions, 17-year-old Carson Peters wows the coaches with his cover of Don Williams' «Tulsa Time,» and the coaches prepare themselves for a battle with Blake Shelton to land the young singer from Piney Flats, Tennessee.«I heard a lot of Oklahoma references in that song,» John Legend begins, noting that he was the first to turn his chair.

Ariana Grande and John Legend had enough of their fellow coaches' fighting on Tuesday's !During the latest round of Blind Auditions, Blake Shelton and Kelly Clarkson were both trying to win over country star Lana Scott — who impressed with her authentic tone while covering Kelsea Ballerini's «Hole in the Bottle» --when they got into yet another feud about who knows more about country music. First, Blake accused Kelly of not recognizing the song. «I toured with her!» Kelly fired back.