Familiar song, unfamiliar grouping of performers

This is a combination I didn’t expect to find: Grace Slick singing “Wooden Ships” with David Crosby and Graham Nash. In 1989, when all three of them were nearing 50 years old.

Airplane and CSN each performed the song, of course. It appeared in 1969 on both the first Crosby Stills and Nash album and on Volunteers. Since neither Stephen Stills nor Jorma Kaukonen are on the stage, the song is lacking the guitar solos found in the more familiar versions.