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But it begins with a non-tonal contemporary view of this material , and evolves ( or , speaking historically , devolves ) into a progressively more diatonic environment , finally ending with a kind of dominant cadence in D , the key of Bach 's great work , after which the Contrapunctus is played . After , I went to Scott McLennan , the LTP Lead , and talked about the Mission Success Chart , and evolving from that , the inner politics of planning the movements of the rovers .