Is the Broadway musical dead, or just hibernating while the theater world decides on the best way to revive the form? After all, in the 500-channel world, it’s difficult to determine whether an art form as broadly based as the musical should be trying to find its niche market, or still seek to appeal to all corners of an increasingly fractured audience. But even if the musical does make a comeback, it’s unlikely that Broadway’s melodies will ever again be recognized as “America’s soundtrack.”