Chichester Psalms

I was listening to Bernstein's Chichester Psalms on the radio yesterday and I remember clearly when I first heard the work back in 1989 - a 50 years since WWII concert with the composer. I was getting on for 40 then but that work had somehow managed to pass me by strange as I'd loved classical music for 20 years before then. What other works have I never got around to listening to? Space still for exploration I hope!