March 22 marks the 80th birthday of every award-winning composer and lyricist Stephen Sondheim, one of the great living genuises of the musical canon. The milestone birthday has set off a flurry of celebrations, retrospectives and productions of his works, which means numerous artists and audiences (including those involved with the new Broadway show Sondheim on Sondheim) are debating which numbers and shows are the true highlights of a career which spans over fifty years. Trying to select the best Sondheim score is as impossible as picking which Picasso painting bests the rest—but we're going to try anyway, with a little help from you. Do you sympathize more with Sweeney or George? Are you moved more by Merrily or Night Music? Hit the polls to let us know which Sondheim masterpiece is the gift that keeps on giving.