Variants of rhythmic speech and legato speech have been used for centuries to treat stuttering. Despite considerable empirical and theoretical inquiry, the reason for the effectiveness of these novel speech patterns in suppressing stuttering is unknown. Recent acoustic research conducted at the University of Sydney suggests that a reduction in the variability of syllabic stress is a critical feature of these two speech patterns, and that this reduction suppresses stuttering by stabilizing the speech motor system. This paper reviews what is known about rhythmic speech and legato speech from this perspective, and the theoretical and clinical implications of reconceptualizing them in this way are discussed.