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In page Nina Simone:

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Simone was perceived as a sometimes difficult or unpredictable performer, occasionally hectoring the audience if she felt they were disrespectful. Schackman would try to calm Simone during these episodes, performing solo until she calmed offstage and returned to finish the engagement. Her early experiences as a classical pianist had conditioned Simone to expect quiet attentive audiences, and her anger tended to flare up at nightclubs, lounges, or other locations where patrons were less attentive.[2] Schackman described her live appearances as hit or miss, either reaching heights of hypnotic brilliance or on the other hand mechanically playing a few songs and then abruptly ending concerts early.[citation needed]