After three weeks, the blind auditions finally wrapped up on Tuesday night, with all of the coaches completing their teams for the battle and knockout rounds. The coaches -- Adam Levine, Blake Shelton, Shakira and Usher -- have been extremely competitive throughout the past few weeks, in hopes of building the best team. 

PHOTOS: 'The Voice': Meet the Season 4 Coaches

The final week of The Voice’s blind auditions inducted big voices and bigger hairdos to the NBC singing competition, including a handful of potential champions. Will the winner of season four be an unsung Broadway alum, a bearded soulster or an R&B WGWG (a la American Idol)?

It's night four of the blind auditions, which sees one contestant falling flat on an Adele song, and Blake Shelton offering to adopt a young aspiring country singer. And with one contestant, Usher cuts it close, pressing his button at the last possible moment.

PHOTOS: 'The Voice': Meet the Season 4 Coaches

Night three of the blind auditions revealed what the newbie coaches will do when they really want someone on their teams: just as Adam Levine usually jumps on his chair and Blake Shelton dusts off some recent award, Shakira will start to speak another language. Spanish? Portuguese? If Shelton has no idea what she’s saying, then it means she’s pretty serious.

After raking in stellar ratings on Monday night, The Voice returns for the second installment of its two-night premiere.

The four coaches -- Shakira, Usher, Blake Shelton and Adam Levine -- continue to turn their chairs for big voices and surprising talent.

PHOTOS: 'The Voice' Teams: Season 4's Performers

NBC is looking to double-down on its biggest non-sports ratings hit The Voice by introducing some new blood to its coaching lineup. For this season (at least), Usher and Shakira will be filling in for Cee Lo Green and Christina Aguilera as they pursue their own projects, but there was a network nervousness over how these new coaches might work with veteran coaches Adam Levine and Blake Shelton.

Returning champion coaches Blake Shelton and Adam Levine welcomed single-name superstars Usher and Shakira to The Voice on Monday night, as season four began the blind auditions with banter, bribery and tear-jerking backstories.

Season four of The Voice will welcome two new coaches to the spinning red chairs. Shakira and Usher will be taking the places of Christina Aguilera and Cee Lo Green, and that’s not the only big change coming to NBC’s hit reality show.

NBC's The Voice opens many doors for its singers, including working with music industry heavyweights, performing on national television and building a large fan base. With the season four premiere coming up March 25, The Hollywood Reporter touched base with season three favorites for their advice on conquering the NBC show’s biggest obstacles.

There's even more of NBC's The Voice coming to a TV near you during season four.

Two Tuesday episodes of the NBC singing competition have been extended to two hours, NBC announced Monday.

PHOTOS: More Than Just Man Candy: Photos of Adam Levine

The April 30 episode, which will feature the knockout rounds, and the May 7 episode, which spotlights the live playoffs, will both be two-hour episodes.

It looks like the new coaches on The Voice are fitting right in.

Usher and Shakira have taken the places of Cee Lo Green and Christina Aguilera for season four, and a new clip -- released exclusively here by The Hollywood Reporter -- proves that the newbies are able to hold their own against the witty vets, Adam Levine and Blake Shelton.

Adam Levine took a jab at The Voice in his Saturday Night Live promos.