I find it *very* hard to believe that Sondheim wrote some of the music to WSS. He might have contributed a line, or gave Bernstein a suggestion, but Sondheim would have had to flat-out walked into Bernstein's brain to write one or two songs--that score is so completely united, with certain technical techniques like tritones unconsciously popping up--the whole score just screams Bernstein, one composer. There's clear connection to Candide.
And he *definitely* didn't write the music for "Cool." I believe "Cool" was among some of the first songs written. The Prologue was perhaps the first, and then the opening of Cool took its cue from the Jet whistle, and measure 36 of the prologue, and that's when Bernstein began to realize he's doing nothing but using tritones...I mean, you really can't credit Sondheim with any of the music unless you want to credit him with ALL of the music.
As for the topic at hand, I find an interesting pattern. Those who cite lyrics say other music composers are better (I, of course agree), while those who say music are just comparing Sondheim's music and lyrics. I too without a doubt would say lyrics. Sondheim's music is wonderful, of course, but IMO, not quite up to the level of the classical/symphonic Broadway composers Gershwin and Bernstein. In fact, in a book I would recommend to anyone with a deep understanding of music and music theory (otherwise you'll get a huge headache) is Joseph Swain's "Broadway Musicals." He musically analyzes some of the best shows in Broadway history, and I think the only 2 he doesn't find not one teeny, eency flaw MUSICALLY (not lyrics) is Porgy & Bess and West Side Story (possibly My Fair Lady). Even in Sweeney, which I think we all agree is Sondheim's greatest musical composition, Swain discusses an ingenius dual/melody that Sweeney has, but than at the very end of the show, when the dual melody has been building up and should be used the biggest, it's ignored. He admits its a teensy, nitpicky flaw, but still.
Is Sondheim one of the best music composers in Broadway history? Of course. Is he the best? No. Is he the best lyricist in Broadway history? I would say so.
One more thing...now, I'm not saying anyone has to agree with it, but ljay, you're crazy if you don't think it's possible to say Sondheim is overrated...the way he is worshipped in theater world, on the board, by critics...come on now. I'm not saying he *is* overrated, but that he's...highly rated enough to be able to be called overrated.
"If there was a Mount Rushmore for Broadway scores, "West Side Story" would be front and center. It snaps, it crackles it pops! It surges with a roar, its energy and sheer life undiminished by the years" - NYPost reviewer Elisabeth Vincentelli