ses: you couldn't swap a song             from the exuberantly explosive pit-band score of Anyone Can Whistle             (1964) with one of the Orientally influenced musical scenes in             Pacific Overtures (1976); you couldn't mistake the neurotic pop             score of Company (1970) for the elegantly ever-waltzing A Little             Night Music (1973).             Sondheim hit his stride in the Seventies, forming a unique             partnership of hyphenates with Hal Prince: a composer-lyricist and a             producer-director working together to re-invent the musical. Some             were plotless (Company), some characterless (Pacific Overtures), one             went backwards (Merrily We Roll Along). But, as his onetime             choreographer Michael Bennett put it, before you can break the             rules, you have to know what they are - and Sondheim knows America's             cultural heritage better then anybody. Follies (1971) is an             affectionate and precise pastiche of Berlin, Kern, Gershwin, Dorothy             Fields, Yip Harburg ... Even as he seemed to be turning his back on             that great tradition, he was also a glorious summation of it.              With Sweeney Todd (1979), the Prince/Sondheim collaboration reached             its apogee, blurring the distinctions between lyrics and dialogue,             songs and underscoring, and combining a complex plot with operatic             emotions to create a unique musical thriller. But their next show,             Merrily We Roll Along (1981), flopped, and the two men went their             separate ways. Sondheim turned to the author and director James             Lapine for Sunday In The Park With George (1984), a work that seemed             at times an autobiographical reflection on the problems of making             art in a commercial environment. His most recent shows illustrate             one of his greatest strengths, hi...