Samuelel Vriezen (piano).Tom Johnson 'The Chord Catalogue'. All 8178 two-to thirteen-note chords possible within one octave.Samuel Vriezen 'Within Fourths/Within Fifths'. Progressions in one to five voices of all possible combinations of notes with each voice being limited to three steps, a perfect fourth apart from the neighboring voices (Within Fourths) or to four steps, a perfect fifth apart from the neighboring voices (Within Fifths).'I like to think of The Chord Catalogue as a sort of natural phenomenon - something which has always been present in the ordinary musical scale, and which I simply observed, rather than invented. It is not so much a composition as simply a list.' Tom Johnson