Instagram/Michael Tilson Thomas Music Legendary conductor Michael Tilson Thomas dies at 81 after brain tumor battle. Grammy winner led major orchestras for over five decades. April 24, 2026 AceShowbiz - Michael Tilson Thomas, the acclaimed American conductor and composer, has passed away at the age of 81 after a prolonged battle with a brain tumour. Known for his leadership of major orchestras in Buffalo, Miami, London, and San Francisco, his death marks the end of a remarkable career that spanned over five decades.