Fulfilling the predictions of many a dubious observer, Imagine This, a let’s-put-on-a-show musical set in the Warsaw Ghetto (and said show is about Masada, no less) is closing after only a month on the London stage. Producer Beth Trachtenberg blames the press for its “narrow-minded critical belief that musicals are limited in their emotional impact and ability to deal with meaningful subject matter in a powerful and sensitive manner.”