The Mormon Tabernacle Choir is a well-oiled machine. With the Choir’s busy schedule, including weekly broadcasts, annual concerts, biennial tours, and CD recordings, Music Director Mack Wilberg calls it “a speeding train that does not stop to let its passengers off.” The Choir’s biweekly rehearsals are planned to the minute—new songs are often added to the already enormous repertoire, leaving little time to stop and celebrate achievements.

As creative musicians, the 360-member Choir is a lively group, despite the buttoned-up reputation that precedes them. This liveliness was showcased on tour when the Choir sang “Hallelujah” from Handel’s Messiah on an airplane, led by guest soloist Alex Boyé.

Another lively moment happened at the conclusion of the final 2015 Pioneer Day concert performance. After two weeks of touring the east coast, the Choir returned to Salt Lake City, and before they had time to unpack their suitcases, they were off to extra rehearsals and two more concerts. After the final performance, the Choir waited in the loft to be released. As the minutes ticked by, the Choir may have realized that they could relax after an emotional three weeks—so they did. They let loose by breaking into an impromptu wave like you’d see at Yankee Stadium—a summer tour stop where the Choir performed a patriotic medley and the national anthem.

The so-called inventor of “the wave,” Krazy George Henderson, once said, “It’s to get everybody involved in something that makes them feel special,” and “the whole thing about the wave is energy.” We agree, and you can’t help but feel happy and energized after watching this:

Watch this ESPN special on the 25th anniversary of the wave: