This was the very last volume of the last released set of the Tangerine Dream Tangerine Tree/Leaves unofficial fan project of the 2000s. (The Leaves were the obscure/lesser unreleased shows that weren't considered quite up to the mark for the Tangerine Tree.)
This one, Volume 91 of the Leaves, is special, though, because it was never in wide fan circulation before the trees, and is an overlooked gem. It is an average to slightly better than average audience recording from the 1977 USA tour with a storming fourth track. Unknown provenenance before the Tree project, but went from the TL WAVs direct to FLAC.