America’s Got Talent Season 21 continued building momentum during Auditions 4, delivering another memorable night filled with emotional performances, innovative variety acts, and two Golden Buzzer moments that immediately reshaped the competition. Simon Cowell and Mel B each selected an act worthy of skipping straight to the live shows, while several other contestants emerged as legitimate contenders as the audition rounds continued.
From breathtaking parkour and heartfelt vocals to original songwriting, mentalism, and one of the season’s most creative dance concepts, the June 23 episode showcased the remarkable variety that has defined Season 21.
Season 21 Hub: Follow every audition, Golden Buzzer winner, contestant page, and weekly recap on our America’s Got Talent Season 21 Hub.
Related Golden Buzzer Performers: Mackenzie Sol and Rubén Roldán Bustos.
Golden Buzzer Tracker
Golden Buzzer Tracker:
- Mackenzie Sol – Mel B’s Golden Buzzer
- Rubén Roldán Bustos – Simon Cowell’s Golden Buzzer
Golden Buzzer Winners
Mackenzie Sol
Mackenzie Sol returned to a Simon Cowell stage more than two decades after first appearing as a child performer. Performing Back to Friends, he showcased polished vocals, confidence, and emotional maturity that immediately connected with both the audience and judges.
Before the judges could finish discussing the performance, Mel B reached for her Golden Buzzer, sending Sol directly to the live shows. The emotional moment instantly established him as one of the season’s strongest vocal contenders.
With his combination of experience, musicianship, and stage presence, Mackenzie Sol now joins the growing list of Golden Buzzer winners who will be among the favorites entering the live shows.
Rubén Roldán Bustos
Spanish parkour athlete Rubén Roldán Bustos delivered one of the season’s most inspiring auditions. After sharing that he lost his leg in a childhood farming accident, he performed an extraordinary parkour routine without using his prosthetic leg, demonstrating remarkable balance, speed, strength, and precision.
Every jump and landing drew louder reactions from the audience before the theater erupted into a standing ovation. Simon Cowell praised both Rubén’s determination and athletic ability before awarding his Golden Buzzer, sending him directly to the live shows.
Rubén’s audition became one of the defining moments of Auditions 4, proving once again that originality, perseverance, and world-class talent continue to shape America’s Got Talent Season 21.
Best Performances of the Night
While the Golden Buzzers dominated the headlines, several other performances helped make Auditions 4 one of the strongest episodes of the season.
Petrox transformed a seemingly confusing dance routine into one of the year’s most creative television moments through an ingenious reverse-play concept.
Bird & Byron impressed the judges with heartfelt original songwriting and rich vocal harmonies that felt authentic rather than manufactured.
Watch Bird & Byron’s Audition
James & Marina elevated mentalism with polished storytelling, audience participation, and impossible predictions that kept both the judges and viewers guessing.
Olivia Befus & Zeke brought warmth and precision to the stage with an entertaining dog act built around remarkable teamwork and trust.
Herwan Legaillard combined danger, suspense, and athletic skill into one of the night’s most dramatic specialty performances.
Biggest Surprises
The biggest surprise of Auditions 4 was Petrox’s reverse-performance concept. At first, the routine appeared confusing. Once the judges saw the replay, the entire performance made sense in a completely different way.
That reveal turned Petrox’s audition into one of the most original moments of the season. The concept was simple to understand after the fact, but difficult to execute, which is exactly the kind of creative risk that often works well on AGT.
Another memorable surprise came from Mr. Hammerhand, who successfully broke 31 wooden baseball bats in 30 seconds and set a new Guinness World Record.
Acts Most Likely to Advance
Several contestants from Auditions 4 appear positioned to remain part of the Season 21 conversation.
- Mackenzie Sol — Golden Buzzer singer with strong emotional appeal and live-show momentum.
- Rubén Roldán Bustos — Golden Buzzer parkour athlete with a unique story and a visually powerful act.
- Petrox — Original dance performer with one of the season’s most viral audition concepts.
- Bird & Byron — Songwriting duo with authentic harmonies and strong judge support.
- James & Marina — Mentalism act with polished presentation and strong television value.
- Olivia Befus & Zeke — Dog act with warmth, precision, and family-friendly appeal.
- Herwan Legaillard — Danger performer with enough suspense and versatility to stand out.
What This Means for Season 21
Four audition episodes into Season 21, the competition has developed one of the strongest early Golden Buzzer fields in recent memory. Mackenzie Sol and Rubén Roldán Bustos now join Lai Noelle, Acro Canine Crew, Luke Taleno, Lara D, Hundred Fingers, and Isaac Atkins as early acts with major live-show momentum.
The episode also reinforced one of the clearest trends of the season: originality matters. Petrox’s reverse dance concept, Rubén’s parkour routine, Bird & Byron’s original music, and James & Marina’s mentalism all worked because they gave the audience something specific to remember.
Season 21 continues to show impressive balance across singers, magic, animal acts, technology, comedy, danger, dance, and specialty variety. That diversity could make the live shows especially competitive once the audition rounds conclude.
Variety Spotlight: Petrox
Watch Petrox’s Reverse Dance Audition
Petrox earned this week’s Variety Spotlight by delivering one of the most inventive audition concepts of the season.
The performance initially seemed unusual and difficult to follow. Then the judges watched it in reverse, revealing that the routine had been carefully choreographed to make sense backward. That twist turned the act into a memorable television moment and gave viewers an immediate reason to watch the performance again.
Acts like Petrox matter because they expand what AGT can be. The performance was not just about technical dance skill. It was about structure, perception, timing, and originality. That combination makes Petrox one of the most interesting non-Golden Buzzer acts from Auditions 4.
Booking Takeaways
Auditions 4 reinforced that audiences respond strongly to singers, parkour performers, mentalists, dog acts, original music duos, dance acts, and danger performers when the act combines technical skill with memorable presentation.
The strongest reactions came from performers who were easy to understand, emotionally engaging, or visually distinctive, from Petrox’s reverse reveal to Rubén Roldán Bustos’ parkour routine and Bird & Byron’s original harmonies.
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Follow AGT Season 21 Coverage
Follow the full season on our America’s Got Talent Season 21 Hub, including weekly recaps, Golden Buzzer updates, contestant pages, and standout performances.
More America’s Got Talent Coverage
Browse all of our America’s Got Talent articles for contestant features, Golden Buzzer updates, weekly recaps, and Season 21 coverage.
Related Season 21 Recaps: Auditions 1, Auditions 2, Auditions 3, and the Season 21 Hub.
America’s Got Talent Season 21 Auditions 4 FAQ
Who received the Golden Buzzers on AGT Season 21 Auditions 4?
Mackenzie Sol received Mel B’s Golden Buzzer, while Rubén Roldán Bustos received Simon Cowell’s Golden Buzzer during Auditions 4.
What was the biggest viral moment from Auditions 4?
Petrox delivered the biggest viral moment with a dance performance that made complete sense when replayed in reverse.
Which acts stood out besides the Golden Buzzer winners?
Petrox, Bird & Byron, James & Marina, Olivia Befus & Zeke, Herwan Legaillard, and Mr. Hammerhand all created memorable moments during Auditions 4.
Did anyone break a world record during Auditions 4?
Yes. Mr. Hammerhand broke 31 wooden baseball bats in 30 seconds, setting a new Guinness World Record.
Which performers look like serious contenders after Auditions 4?
Mackenzie Sol, Rubén Roldán Bustos, Petrox, Bird & Byron, James & Marina, Olivia Befus & Zeke, and Herwan Legaillard all emerged as acts to watch.
