The casting call for Hair (the book) was probably pretty similar to that of Hair (the musical). Seeking: bearded Jesus look-alikes (Portuguese Christian Princess St. Wilgefortis makes an appearance), long-haired hippies (we don’t know that for sure, but some of the contributors seem like likely candidates), stylised afros (from the ridgey-didge Aboriginal versions to African parlours in Enmore) and sexual overtones (a poem on pubes, par example). The follicularly-challenged need not apply.
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