Watch 'Neil Young' cover 'Fancy' on 'The Tonight Show' |

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Watch 'Neil Young' cover Iggy Azalea's 'Fancy' on 'Jimmy Fallon'

Jimmy Fallon

(Douglas Gorenstein/NBC)

It’s ”Déjà vu” all over again.

In a segment on Monday’s episode of The Tonight Show, Jimmy Fallon appeared in the guise of rock legend Neil Young to put an acoustic spin on ”Fancy” by Iggy Azalea. Fallon crooned, and even threw in a little harmonica, but the performance kicked into a whole other gear with the arrival of David Crosby, Stephen Stills, and Graham Nash, who worked up the famous four part harmonies of Crosby, Stills, Nash & Young (with Fallon making this a CSN”Y” reunion).

The performance isn’t a total surprise coming from Fallon, who has made a name for himself with musical segments that swerve in new directions (see his Broadway covers of hip-hop, his covers of songs with classroom instruments, or even his lip-sync battles). Though to be fair, ”Fancy” already has a built-in ’90s take on itself, so maybe a ’70s version was inevitable.