For RTÉ Arena, music journalist Pat Carty revisits the music of Crosby, Stills, Nash and Young - listen above.
This year marks the fiftieth anniversary of the original supergroup; their music lives on through their acclaimed second album - and the band's masterpiece - Déjà Vu.
Tune into to RTÉ Arena live nightly from Mon-Fri on RTÉ Radio 1 from 7pm - or listen back here.
