Speech-Music Therapy for Aphasia (SMTA) is applied in the treatment of childhood apraxia of speech. A single-subject design study into the effect of SMTA was conducted, showing a striking improvement in the realization of initial consonant clusters after treatment. Musical scores of the target items with initial consonant clusters were analysed to determine the musical manipulations that were used. In all target items with initial consonant clusters an anacrusis was used. This musical manipulation may have provided an auditory rhythmic cue for the phasing relationships of speech gestures in consonant clusters. Further research is needed to determine effective musical manipulations that are used in SMTA