Reading around, they used backing tapes for 'Trilogy' and 'Abaddon's Bolero'. There's versions of both on YouTube- the former was a little messy, but if it had had time to 'bed in', maybe it would have gotten better. I think they should have at least done the introductory Emerson/Lake section live more often.
Didn't they only play 1st Impression Part 2 anyway...which was always in the same key as the BSS version?
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