Crosby, Stills and Nash appeared on The Tonight Show Starring Jimmy Fallon Monday night to promote the release of CSNY 1974 – a live box set featuring performances from their 1974 reunion tour that is available today on Amazon.

Check out this web-exclusive video of the trio performing “So Begins The Task” below.

CSN was also joined on the show by “Neil Young” for a CSNY reunion performance of sorts. Check it out here.