Yet it remains a fascinating conundrum, that for all the Dead's worldwide popularity and voluminous history, some factual details remain tantalizingly just beyond our knowledge.
A perfect case is shown by some special guests jamming with the Grateful Dead in their prime, on tape, at Chet Helms Family Dog On The Great Highway, on Sunday August 3, 1969. I have struggled with the mystery of August 3, 1969 before, in a different context, but the 2017 Grateful Dead Marathon brought the question into sharp focus.
The album series was conceived after Zappa shelved a proposed live album, Warts and All, and two tracks intended for that album appear on this series.
The individual Shut Up 'n Play Yer Guitar albums and box set have been well received by critics, and Zappa subsequently produced two more albums focusing solely on guitar-oriented music: Guitar (1988) and Trance-Fusion (posthumously released in 2006).
A tenor saxophonist and an electric violinist sit in for various numbers, including "High Heeled Sneakers" and a remarkable "Dark Star," and they make the performance a unique musical exploration indeed. While the tape has been available for some time, as usual host David Gans had a top-of-the-line mix that brought out the best in the music.
It's one thing to hear musicians sit in with the Dead for a blues jam, but it's another to hear an electric violin and tenor sax comfortably weaving in and out of "Dark Star" with Jerry Garcia and Phil Lesh. Now, Deadlists says that the guests were Charles Lloyd and David La Flamme, but those are unlikely suppositions based on little more than air.
Its population as of the 2013 census was 1,680 inhabitants, giving a density of 5,802 inhabitants per square kilometre (15,030/sq mi), which is only half the average density of the city of Dakar.
Of course, the Dead also stand out for having not only taped but preserved many of their old shows, so we have an extensive musical record of the band in their glory days.
Thus scholarship on the history of the Grateful Dead's music has thrived, with so much glorious source material.
Other important centres for the slave trade from Senegal were further north, at Saint-Louis, Senegal, or to the south in the Gambia, at the mouths of major rivers for trade.
Gorée is a small island 900 metres (3,000 ft) in length and 350 metres (1,150 ft) in width sheltered by the Cap-Vert Peninsula.