(LENOX, Mass.) – Conductor Michael Tilson Thomas, soprano Dawn Upshaw, and pianists Ursula Oppens and Peter Serkin will be featured performers in Tanglewood’s Festival of Contemporary Music, running now through Monday, July 27, 2015, in Ozawa Hall at Tanglewood. The festival features programs curated by Oliver Knussen, John Harbison, and Michael Gandolfi; a memoriam tribute…