Music at the close. The adage is leave ’em wanting more, not less, but Stephen Sondheim has barely skirted the latter fate. At eighty-one, he’s been erratically revising a problem child since 1999 that is now called, blandly, Road Show. Under various uninspired titles — Wise Guys, Gold!, and Bounce — the musical flipped and flopped around the country from Chicago to New York and Washington D.C. At every step of the way Sondheim, being Sondheim, attracted the biggest names to direct and star, including Hal Prince and Nathan Lane. But no luck.