The booklet tells us that as “the recital took place in an open air theatre, a significant amount of external noise was captured, including motor vehicles and passing planes… Most of the noises, some of which were very intrusive, have been removed, though at times the result is an unavoidable compromise of the quality of the remastered audio”. Well, all I can say is that they must have done an exceptional job, because I was not troubled a single time by any untoward noise or noticed any compromised sound. The recording is, of course, not up to the highest standards (it was simply made as an archive document, with no intention of its being issued) and the upper frequencies are a little shrill at times with slight distortions on occasional climaxes, but I cannot believe anyone will find it in any way unacceptable.