At 1 p.m. on Easter Sunday, WRTI-FM (90.1) will rebroadcast Yannick Nézet-Séguin conducting one of the supreme monuments in Western music, Bach's St. Matthew Passion. An impressive roster of soloists, the Westminster Symphonic Choir, and the American Boychoir join the Philadelphia Orchestra in this performance from 2013, the orchestra's first of the famous oratorio in nearly 30 years.