CAMBRIDGE — Like the savviest old-time movie stars, Apollo’s Fire, the Cleveland-based Baroque orchestra directed by harpsichordist Jeannette Sorrell, knows how to cast itself in the best light. Its Friday program at First Church in Cambridge was love-themed, with an emphasis on jealousy and madness (and a pair of composers, Handel and Vivaldi) suiting the group’s extroverted style. They brought along a soloist — soprano Amanda Forsythe — with no small star power of her own. (They also brought a tableful of their latest CD, featuring Forsythe.) And throughout, the group doubled down on its best attribute, its sound: early-music straight-tone point po

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