And in the encore after Love the One You're With and before Teach Your Children Well came another gem - Stills in fine voice on For What It's Worth by his pre-CS&N band Buffalo Springfield.
Earlier, Nash's old Military Madness had its contemporary counterpart in a fine new country-flavoured In Your Name about killing in the name of a faith.
So while ticking off obligatory crowd-pleasers (Southern Cross, Wooden Ships, Marrakech Express, Deja-Vu, Our House etc) backed by a cracking five-piece band, CS&N also delivered an unexpectedly invigorated performance.
And in a stripped-back acoustic set opening the second half included an endearingly wobbly treatment by Stills of Dylan's Girl from the North Country and Crosby's trippy Guinnevere [sic].
If the harmonies are a little less lustrous and Stills' voice sometimes wavering, there were ample compensations in this diverse and sometimes even daring set list.
Crosby's vocal power on Almost Cut My Hair was extraordinary and Stills strangled out electrifying tremolo/crescendo guitar solos.
Anthems of their generation, politics, classic songs, humour (70-year old Crosby said: "I'm supposed to write the weird shit, and I'm particularly well suited to the task") and credible new songs.
More than four decades on from their debut and certainly not coasting.