As a preface to the BBC's Stockhausen series at the Barbican. Paul Griffiths introduces two of Stockhausen's continuing series of Piano Pieces, the more recent of them a concert version of part of the opera Samstag aus Licht.

Klavierstuck IX

Lucifer's Dream (Klavierstuck XIII) (first UK broadcast)
played by Philip Mead

(Stockhausen: Music and Machines begins next Tuesday)