Michael Haslam is a three-time Olivier award-winning musical director who works in theatre, TV and radio as a composer, arranger and conductor. Haslam sat down with London Calling to talk about the new production of All the Angels at the Sam Wanamaker Playhouse at Shakespeare’s Globe. This musical play is based on the true story of how Handel wrote Messiah, one of the most famous and frequently performed choral works in the world.