All but forgotten in the field of surround sound are the efforts of UK classical music label Nimbus Records
. More than 25 years ago, Nimbus recorded with Peter Fellgett and Michael Gerzon's two-channel–compatible, matrixed UHJ Ambisonic Surround system, using multi-capsule Calrec Soundfield microphones. Other labels, including Unicorn-Kanchana, also supported Ambisonic, releasing such rarities as a UHJ Ambisonic recording of the soundtrack to North By Northwest
on LP. Playback decoders were available from the UK's National Research and Development Council (NRDC) and speaker manufacturer IMF. As timing would have it, the Ambisonic releases appeared when users could still recall the unfortunate experience of 1970s quadraphony, and Dolby Digital was still some years off. However, those who have heard proper demonstrations maintain that the UHJ Ambisonic technique remains the most convincing surround-sound format ever.