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Nostalgia alert! Watch Hanson perform acoustic rendition of 'MMMBop'

/ Source: TODAY

It's been nearly two decades since Hanson topped the charts with "MMMBop," but fortunately Isaac, Zac and Taylor aren't over their infectious 1997 hit.

The Oklahoma-bred trio appeared on ABC's "Greatest Hits" Thursday night and performed an acoustic version of the song that proved that though their long, blond manes are no more, their harmonies are still intact.

"We have never run from our past. We definitely still sing 'MMMBop'. When we do concerts, we still play old songs," youngest member Zac, now 30, told E! News last week.

The brothers recently made the surprising revelation that many fans have been singing the catchy tune the wrong way all these years.

"People can't sing the chorus right," Isaac told New York magazine in March. "Most of the time they syncopate it wrong."

In the same interview, Taylor pointed out that its lyrics are a bit darker than its upbeat chorus suggests.

RELATED: Hanson to the world: You've been singing 'MMMBop' wrong all this time

"It does tap into a theme we've continued to have, which is to interweave relatively serious thoughts — the verses, you know, 'You have so many relationships in this life / Only one or two will last / You go through so much pain and strife / You turn your back and they're gone so fast.' It's not exactly sunshine and rainbows," he said.

"We used to always tease that we write happy sad songs," Isaac added.

For more '90s nostalgia, check out the band's first visit to TODAY in the video below.