Daniel Barenboim looks indeterminate in age in the cover photo of this release and nothing else tells the buyer that these are historical performances, recorded in 1970 and never before release. One of them, the Piano Concerto No. 23 in A major, K. 488, is live; the other is an analog studio recording. Nothing in the booklet (in German, English, and French) explains how these recordings happened to languish in the vaults for four decades and then resurface. Yet none of this affects the product, which is very fine.