The Foo Fighters frontman drew a blank when it came to Nirvana
We've become used to seeing Dave Grohl popping up via Zoom calls and Facetime on various talk shows over the past year.
Now that things are getting back to normal - at least in the US - his most recent appearance was in-studio on The Tonight Show with Jimmy Fallon.
Grohl took part in a 'Off Songs, Song Off' game with Fallon, where he basically had to guess the names of popular songs that were played by the show's in-house band The Roots - albeit with a unique twist.
As you might expect, with Grohl involved there's more than a little good humour in the mix - especially when he doesn't initially recognise a song by his own (former) band.
Some of these are hard, though...
And in case you were wondering, THIS is what 'Back That Azz Up' by Juvenile sounds like: