Boston is a great music town, home to several distinguished music schools, several concert halls with remarkable acoustics. Among the best, this one: Jordan Hall, part of the New England Conservatory. The school hosts many free concerts each month, most of them modestly attended. This night, every seat was taken and people were sitting on steps and in the aisles for the NEC Philharmonia’s centenary performance of Stravinsky’s ‘Rite of Spring’ with conductor Hugh Wolff. Still thrilling and shocking after 100 years. No riots this time though.