There are a select few musicals that, despite bombing during their original New York productions, have been produced with surprising regularity by regional theaters across the country, often with revised books. Some have been kind-of fixed, like Merrily We Roll Along or Candide, both of which can make for wonderful entertainment, if not great musicals in and of themselves. Others, such as Anyone Can Whistle or Mack & Mabel, simply don’t work, regardless of who tinkers with what. The reason why such shows continue to be produced despite flaws is that they fulfill two specific criteria. First, they need a wonderful score, the kind that makes the show on record seem like a surefire hit. Secondly, they need a subject matter that sounds interesting enough on paper to make theatre companies think that they will be the first to “crack” the material where others have failed. Such is the case with TheatreWorks, Silicon Valley’s production of Rags, which ultimately does not come together to create a satisfying evening of theatre, but offers enough of interest to reveal why companies still keep giving Rags a shot.