This study assessed the effect of the concept and imagery of ‘halo’ (developed from the Marchesi pedagogical model for achieving vocal quality in different registers) on voice quality of four female singing students of western classical voice. Using a repeated measures design, acoustic analysis of Long Term Average Spectra (LTAS), Energy Ratio, and Singing Power Ratio were assessed for each of the students while the singer was using and not using the halo technique. The voice samples were randomised and placed on CD for blind perceptual analysis. Experienced adjudicators assessed the overall quality, vibrato, and richness of each sample. Although acoustic analyses revealed no significant differences between the two conditions, the judges consistently rated the halo samples higher than the non-halo samples. Further research with larger samples is needed to determine the effectiveness of this method for improving voice quality in the western classical female voice.
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