Which British theatrical producer that appeared on the BBC's The Sound of Musicals, was considered  "the most successful, influential and powerful theatrical producer in the world" by the "New York Times?
The Sound of Musicals The Sound of Musicals was a 2006 four part BBC series starring several different musical theatre actors and some other professional singers who performed acts from different musicals. Each week the standard cast was joined by a celebrity guest host who also performed their favourite numbers. The show also featured interviews with people involved in musical theatre such as Andrew Lloyd Webber, and Cameron Mackintosh.
Thelma Holt Thelma Holt (born 4 January 1932) is a British theatre producer and former actress.