According to theatre critic Michael Billington, Thatcher left an "emphatic mark" on the arts while prime minister. One of the earliest satires of Thatcher as prime minister involved satirist John Wells (as writer and performer), actress Janet Brown (voicing Thatcher) and future "Spitting Image" producer John Lloyd (as co-producer), who in 1979 were teamed up by producer Martin Lewis for the satirical audio album "The Iron Lady", which consisted of skits and songs satirising Thatcher's rise to power. The album was released in September 1979. Thatcher was heavily satirised on "Spitting Image", and "The Independent" labelled her "every stand-up's dream".