In December 1974 Tangerine Dream played inside Reims Cathedral, for an audience estimated at six thousand people. The concert caused considerable uproar, and pop concerts in French cathedrals were banned shortly afterwards. It captures Edgar Froese, Christopher Franke and Peter Baumann across two sets of organ, mellotron and Moog sequencers, played in the long reverb of the building. The recording only became available on vinyl decades later.

This edition is a 2-LP on 180 gram, a limited Record Store Day pressing in a gatefold sleeve with a sixteen-page booklet.