New Century Chamber Orchestra’s current program, titled “Serenades and Dances,” bookends a pair of shorter, lighter works around a core of two large-scale mainstays of the standard repertory, Antonin Dvořák’s Serenade for Strings and Benjamin Britten’s Serenade for Tenor, Horn, and Strings. Big kudos are due Music Director Nadja Salerno-Sonnenberg, for her programming and musical leadership, because on Thursday, at Berkeley’s First Congregational Church, all four works got top-notch, absorbing performances, with the Britten lifted to greatness by the brilliance of tenor Brian Thorsett and horn player Kevin Rivard.