Mumford & Sons have now secured their place at the top of the music industry after a mere two years since their Grammy nomination as Best New Artist in 2011. Now in 2013, their Grammy award-winning album “Babel” tops charts, and they sell out concerts. After selling out a first show on Feb. 6 at the Barclays Center in Brooklyn, Mumford & Sons added a second show on Tuesday, Feb. 12.

Opening for Mumford & Sons were the band HAIM and solo artist Ben Howard, but half the audience would not know. Less than half the stadium heard the LA-based band of sisters named HAIM, missing their unique rhythms and up-beat melodies. The stadium filled significantly by the time Ben Howard began singing his gentler, London-accented tunes.

Although the openers were well-received by the crowds, fans of Mumford & Sons filled every seat in the sold-out arena during the set change between Howard and the main act. Beginning the show with the title track off their newest album, “Babel,” the show’s energy did nothing but increase with each song.

Normally a four man band consisting of Marcus Mumford, Ben Lovett, Winston Marshall and Ted Dwane, the group added three string and three horn players to round out their sound, ensuring even those in the nearly-vertical nose-bleed seats could feel the band’s music. With each member of the band capable of playing multiple instruments, they added to the vocal purity that has defined Mumford & Sons, making their performance flawless.

The audience was basked in the glow of lights strung over the main floor, adding a whimsical element to a hugely powerful performance. Mumford & Sons’ songs followed one another smoothly and interestingly, moving seamlessly from older songs like “Little Lion Man,” to their newer “Lover of the Light,” to the haunting “Thistle and Weeds.”

With the banjos, trombones, trumpets and upright piano amidst the sold-out stadium filled with thousands of fans, this contradictory nature was even more evident through the screens magnifying the performance for those farther away. This black and white display, shot with multiple cameras that were both on stage as well as in front of it, gave fans the impression that they were part of a music video. The old-time feel of watching a concert in black and white, with an artistic focus on one of Lovett’s hands slamming chords on the piano, enhanced the group’s already unique performance.

Instead of a traditional encore on stage, Mumford & Sons carried their instruments across the ground floor to a smaller acoustic stage in the back. As they began singing, it became apparent this was a different show than they had just performed. Singing and playing into a single microphone, the group stood in a circle that faced inward. Fans quickly realized that screaming, and even talking, would hinder their ability to hear. Other than the occasional response of, “Brooklyn!” and “Right here!” yelled during songs like “Where Are You Now,” the band awed the entire stadium into a near silence.

Returning to the main stage, Mumford & Sons then called back HAIM and Ben Howard to perform a cover of The Band’s song “Weight.” With the group dancing on stage, it looked more like a jam-fest than any performance to fans. Each microphone was shared with musicians from each band, and the soaring trumpet and violin solos stretched the song far beyond its usual length.

Mumford & Sons played for nearly two hours, giving their fans both blasting instruments and impeccable vocals during every moment of the show.