They've been called "the best-known elementary-school chorus on the planet," and they've performed with everyone from Katy Perry to Common, but the adorably harmonizing kids of New York's PS22 Chorus are probably always going to be best known for their YouTube covers of other artists' hits -- and they've done it again with their version of Swedish House Mafia's latest (and presumably final) single, 'Don't You Worry Child.'

The song, currently a major iTunes hit that's sitting just outside the Top 10 on Billboard's Hot 100 chart, is arguably over the heads of some of the kids singing it in this clip, but there's something undeniably affecting about hearing a roomful of children sing lines like "My father said / Don't you worry, child / See, heaven's got a plan for you." (The folks at Idolator admitted to getting misty-eyed over the performance, and you may find your own waterworks following suit.)

Not that they really need any outside assistance, but the PS22 kids are joined here by Ithacappella, aka the Ithaca College Men’s Chorus, who add a little extra bass to the proceedings. We've embedded the clip above -- check it out and see if you don't feel like buying the Swedish House Mafia version when it's over.