Hearing the soulless record of Crosby, Stills, and Nash’s latest reunion tour, today’s teenagers may wonder what made these guys so noteworthy in the sixties.

One answer is Neil Young, who has long since gone his own way; another is the collective spirit whose apparent disappearance is harder to explain than the fact that the trio keeps regrouping. (There is, after all, a lot of gold in them there grooves.) At any rate, Allies is a not-very-live-sounding live album that offers an overlong rehash of Stills’s old “For What It’s Worth,” a by-the-book rendition of the Beatles’ “Blackbird,” and eight other indications that, while talent may linger, the chemistry does not.