Will Marion Cook's Clef Club Orch. with Fletcher Henderson

According to Swing Along: The Musical Life Of Will Marion Cook by Marva Griffin Carter (Oxford University Press, 2008), when Will Marion Cook returned from Europe in March 1923, he toured with a 25-piece Clef Club Orchestra, performing at Baltimore's Douglass Theatre (March 23, 1923) and Philadelphia's Dunbar Theater, with 'Paramount Recording Wizard' Fletcher Henderson at the piano.

Here's the ad for the first concert, published in the Afro American, March 16, 1923 (note the "35 Musicians and Players" tag).

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