Maroon 5, Foster The People Rock Grammy Stage With The Beach Boys

Performance of 'Good Vibrations' marks reunited veteran band's first live show in 20 years.

Back in December when the Beach Boys announced their reunion, Al Jardine promised a "surprise" at the 54th Grammy Awards on Sunday (February 12). "We'll do something really exciting. There's a lot of interest in it, which is nice," the guitarist told Rolling Stone.

"It's going to be a very big operation," Jardine added.

That something exciting turned out to be an exhilarating medley of some of their most recognizable hits performed by Foster the People and Maroon 5, before the Boys took the stage themselves for a performance of "Good Vibrations." Late in the song, the legendary band invited their modern counterparts in music to join them.

Things kicked off with Maroon 5's rendition of "Little Surfer Girl." As Adam Levine crooned one of the Beach Boys' earliest hits, '60s-style psychedelic images swirled on the LED screens behind him. Next to the stage were the boys of FTP, who took on "Wouldn't It Be Nice" on a stage littered with surf boards.

[article id="1678926"]MTV News spoke to Foster the People[/article] at Grammy rehearsals earlier this week and they were in awe of the rock gods.

"We grew up listening to their music since we were little kids -- I probably wouldn't be in music today if it wasn't for them," frontman Mark Foster said. "So to see them all in the same room together, and then playing with them, it's wild. It's a dream come true.

"They're one of the best bands of all time," he continued. "Brian Wilson has left such a mark on musical history, to be able to see him up there with the other guys doing what they do, it's amazing."

After Foster, the Boys hit the stage for a solo (at first) "Good Vibrations" in what was the first live performance by all of the surviving Beach Boys -- Brian Wilson, Mike Love, Jardine, Bruce Johnston and early member David Marks -- in more than 20 years. The band is recording together again and will begin a reunion tour later this spring at the New Orleans Jazz Fest in late April.

Late in the song, both Maroon 5 and Foster the People joined the reunited Boys onstage to finish "Vibrations," with both bands looking floored to be sharing the Grammy stage with one of the most important bands in rock history.

Stick with MTV News for all the news on Whitney Houston's tribute, the Grammy red-carpet fashion, [article id="1678701"]Grammy winners[/article] and more until the hangover wears off!