Together with Tilda Swinton making her first on-stage appearance at the festival, the composer and pianist treats a Saturday morning audience to pieces from 2004's protest record The Blue Notebooks. Watch more highlights on BBC iPlayer: https://www.bbc.co.uk/iplayer/episode... Listen to sets and highlights on BBC Sounds: https://www.bbc.co.uk/sounds/curation... Follow all on social @BBCGlastonbury.