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(a) Two waves ‘in phase’, adding to each other; (b) two waves ‘out of phase’, neutralizing each other so that no sound is heard. Grove Music Online. Retrieved 20 Jan. 2020, from https://www.oxfordmusiconline.com/grovemusic/view/10.1093/gmo/9781561592630.001.0001/omo-9781561592630-e-8000006252.