“Pentatonix” has made a cappella music popular again in the United States. There are no instruments in their versions of well-known songs. With just their voices, the group gets to the heart of each song.

In this video of Leonard Cohen’s song “Hallelujah” being played live, the crowd starts to cheer as the lights slowly come on. Each verse has a different lead singer.

They stand on a stepladder on stage while stars shine in the background. The group is dressed in fancy clothes that stand out. As the beat-boxing comes in on the chorus and the song gets more intense, the lights start to move.

Some of the best musicians and singers in the world have done their own versions of Cohen’s “Hallelujah.” The song was done by Bob Dylan, Willie Nelson, and Justin Timberlake, each in their own way.

The Canadian singer Leonard Cohen wrote the song, which first came out on his album “Various Positions” in 1984. It didn’t get much attention until John Cale and then Jeff Buckley sang it.

It was in the popular animated movie “Shrek,” and since then, maybe 300 different arrangements have been made of it. This a cappella version of “Hallelujah” is just as good as any other version.

The group “Pentatonix” came together in 2011 and won the third season of “The Sing-Off” on NBC. They got a recording contract, and since then, their music has been all over the country. After putting out albums that have sold millions of copies, “Pentatonix” has become a musical force of nature.