By Elizabeth Barhydt

Rob Mathes does not just bring a holiday show to Westchester each December. The festival convenes a summit of New York’s A-list players, a choir that sings like a conservatory, and a book of original songs braided with Ellington-grade horn writing and English-choral glow. The room is the PepsiCo Theatre at The Performing Arts Center, Purchase College— just over the state line in Harrison, at 735 Anderson Hill Road—close enough for Greenwich to claim it as home turf.

The show’s Greenwich roots run deep. Mathes grew up here, studied with revered local teachers, and traced his catalyst to a Greenwich High School jazz-ensemble performance in the old Hollister auditorium where, as a ninth grader from Eastern Junior High, he watched his uncle, trombonist and composer Skip

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