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Young Leonard Bernstein recorded just about the whole of the standard repertoire for Columbia recordings. Later, as an old man, he re-recorded almost everything he had done for Columbia with DG. Therefore, the question always remains whether to go with young Bernstein "Columbia-era" or old "DG-era" Bernstein.
Generally speaking, I find young Bernstein more outspoken and boisterous full of fire and energy. Those old Columbia recordings have a sense of warmth and richness.
The DG recordings on the other hand, find Bernstein more contemplative and searching. His recordings still extract every morsel of flavor from the music, but does so in a different way that lingers over every phrase as opposed to setting the battlefield on fire.
While Bernstein's DG recording of Gershwin's "Rhapsody in Blue" seemed to have won me over, I'm not as sure about Copland's "Appalachian Spring" which, for me, sounded more heart-felt in the earlier Columbia recording. Along this line, Bernstein brings forth a bold and bright "Rhapsody in Blue" that also swings, and pays tribute to the music as a full classical concert piece as opposed to a glorified "pops" material.