Taking one of Stephen King's most chilling books - "Carrie" - and turning it into a musical has proven to be a difficult task for the world of big time theater. Now, the truth of that great book has emerged after endless rewrites and re-scores and re-re-re-how can we fix this. Just how good a musical they've ended up with was on joyous display Friday night when Theatre Unchained opened "Carrie: The Musical."