 The rock band Led Zeppelin (qv) are notoriously hesitant to allow  their music to be licensed for commercial purposes. Knowing this,  Richard Linklater (qv) filmed a plea by actor  Jack Black (I) (qv) in front of 1,000 screaming fans, imploring  the band to let the production use the "Immigrant Song" in the  movie. The plea worked and the filmed request is included on the  DVD.