One of my all-time favorites is Chess. Written by Tim Rice, Benny Andersson and Björn Ulvaeus (yes, the guys from ABBA), the concept album was released in 1984 and I first heard it about 5 years later (... except for the "big hit" that came from it -- Murray Head's "One Night In Bangkok."
In 2008 (and broadcast on PBS in 2009) a revival concert was staged in London with some of today's biggest musical names like Josh Groban, Adam Pascal & Idina Menzel.
I will always prefer the original.
The part of Florence is one of the greatest female roles ever and while I adore Idina, Elaine Paige just kicked serious ass singing it (which you can see after the lunch!).
And now, my favorite promo clip from back in the day. The video is cheesy (as most from the mid-80s are), but the song still kicks: