This video is from one of the best independent films I have ever watched, The 32 Short Films about Glenn Gould. A brilliant musician, child prodigy, eccentric misanthrope, misunderstood artist in every sense of the phrase. Watch this brief scene, not only for the gentle study in contrast between the producers behind sound proof studio glass and the artist, but for the pure blissful rapture expressed by this brilliant actor embodying the unbridled joy of a true master in the midst of his creation.
Brilliant. If you have not seen this film when it was first released, do so now!