On Thursday, September 18, 1969, Bill Graham opened a four-night stand at the Fillmore West with a bill that reads, in hindsight, like a crossroads of American music: Taj Mahal at the top, Buddy Guy in the middle, and the English band Spooky Tooth at the bottom, the whole thing washed in the Brotherhood of Light's projections. The engagement ran Thursday through Sunday, September 18–21. The poster that announced it — BG-192 in Graham's running series — is one of the early jobs by Randy Tuten, the young San Francisco artist Graham had hired at the start of 1969 as an in-house poster designer (per the Victoria & Albert Museum, which holds a copy, accession E.499-2004, and Wolfgang's). The photograph worked into the piece is credited in the catalog record to "Jim Marshell" — almost certainly the San Francisco rock photographer Jim Marshall, though the misspelling travels intact from archive to archive and is worth flagging rather than stating flat.

The bill itself is the story. Taj Mahal, born Henry St. Clair Fredericks, was in 1969 doing something quietly radical: reintroducing rural, pre-war Delta and country blues to a young rock audience that had mostly met the blues secondhand, through British bands. Under him sat Buddy Guy — the electric Chicago article, a guitarist whose ferocity had already reshaped what the instrument could do. And under Guy sat Spooky Tooth, the Carlisle, England group built around Gary Wright and Mike Harrison, third-billed and a long way from home (per the V&A record). Read top to bottom, the poster is almost a genealogy: the blues at its source, the blues electrified in Chicago, and the blues refracted back across the Atlantic as English rock.

There is a small, satisfying rhyme buried in the venue history. Spooky Tooth had played San Francisco on this very date one year earlier — September 18, 1968 — but in a room a fraction of the size: the Matrix, the little club on Fillmore Street, on a residency with the songwriter David Blue (per the COAU cache). The Matrix is where a great deal of this scene incubated; Jefferson Airplane had effectively opened it as their home club in 1965, and it kept a low, steady hum of residencies going for years. For Spooky Tooth to move in twelve months from that intimate stage to third billing on a Graham weekend at the Fillmore West is a tidy measure of how fast the whole ecosystem was scaling in 1969.

BG-192 survives well. Wolfgang's lists a first printing — printed once, before the show — and the V&A holds a copy in its permanent poster collection, which is about as durable a provenance as a piece of Fillmore ephemera can claim. That institutional footprint, more than the marquee names, is why this night anchors the date: not just a good show, but a well-documented one, catalogued, credited, and preserved.

The same Thursday was busy elsewhere across the scene. Out at the Family Dog on the Great Highway, the shared week-card FD-690915 covered a run of nights whose Thursday event was a Richmond Symphony performance, with a "Circus of the Absurd" costume ball — Carlos Carvajal, a Moog synthesizer demonstration, and local bands — filling the Friday-through-Sunday slots that followed (per the COAU cache and Corry Arnold's Rock Archaeology 101). The FD-690915 card's designer is not named in any reachable source and is recorded here as an honest gap.