Sweeney Todd - hands down. IMO, it is the absolute, unchallanged, best musical ever written. It's brilliant in every way, shape, and form, and the ACT I Finale is incredible. I just love it! I seriously do not think it will ever be topped. It is a timeless tale that is told so magnificantly. Do I love it, or what?
Honorable mention would probably go to Les Miserables or Ragtime, for me! These, IMO, are the 2nd (Ragtime) and 3rd (Les Miz) best musicals ever written. It's still a sin that TLK won best musical over Ragtime. I lost all respect for the Tony Awards that year.
"What the hell happened to you? You look like a Make-A-Wish Kid. You know, I just knew you were gonna bring shame on this new family of ours, and it just figures you had to go make yourself over into some heroin-shootin skate board chic on the only day E! could interview you!" - Cherry Cherry, on her daughter Mary Cherry