The American star in the sixth programme in her new series with special guest, John Hartford Pan's People Bobby's guest tonight, the young American singer John Hartford, 'paints' rather than writes his songs. John abandoned his career as a commercial artist to become a song writer - and doesn't regret it. His smash hit 'Gentle on My Mind' won him four major awards last year, and has been recorded by more than 170 artists, including Dean Martin and Frank Sinatra.