Digital technology is changing the ways that theatre is written and staged: the parallel virtual world in Jennifer Haley’s drama The Nether and the spooky walking-through-walls effects in Ghost the Musical would both have been impossible to produce without recent advances in video projection and lighting. It is more surprising to find, though, that new technology can make such an impact on a song-and-dance show that is in two senses old: City of Angels is set in the 1940s and was first performed in 1989 on Broadway, when it was nominated for 10 Tony awards and won six.It is probably the most visually ambitious work ever written for musical theatre. Created by Larry Gelbart, one of the most accomplished talents of popular American comedy, it is also a rare example as well in this gen