From 1986 to 1990, Pidgeon was the lead singer of the British folk/pop band Ruby Blue. Pidgeon left Ruby Blue shortly after the band signed a major record label and was beginning to gather both commercial and critical success. She appeared in her first feature film in 1988, The Dawning. She then decided to concentrate on her acting career, starring in David Mamet's plays and films, initially in the movie Homicide, then in the play Oleanna, a part written for her by Mamet. Pidgeon composed the music for the film version which starred Debra Eisenstadt in her role.