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1. 'For more new sounds' (1933-1948) 2. 'To sober and quiet the mind ...' (1946-1951) 3. 'Throwing sound into silence' (1951-1956) 4. Indeterminacy (1957-1961) 5. 'Music (not composition)' (1962-1969) 6. 'Joy and bewilderment' (1969-1992).