The LSO’s Principal Guest Conductor Michael Tilson Thomas celebrates his 70th birthday this month with a pair of concerts focusing on British and Russian music, but with a nod to his native USA. In both concerts he’s joined by the sensational young Chinese pianist Yuja Wang in Gershwin’s popular Concerto. Michael Tilson Thomas gave the US premiere of Colin Matthews’ Hidden Variables, an LSO commission during Matthews’ time as an Associate Composer with the Orchestra.