Someone whose career in music began before the invention of the tape recorder will have witnessed a revolution in music technology. Peter Ridsdale shares the experiences of a man who has spent a lifetime composing for pictures.

With its ability to manipulate sounds and music, the digital sampler has probably caused more arguments than any other musical instrument to date. Peter Ridsdale takes an alternative view.

One of the stars of Channel 4's Fourmations, Brian Johnson's Improvisions combine musical performance with real-time manipulation of video images. Peter Ridsdale trips on this.