The purpose of this study was to determine the effect of a "rockumentary" music therapy intervention on readiness to change and craving in patients on a detoxification unit utilizing psychometric instruments in a randomized three-group design. Participants (N = 141) were randomized by group to a rockumentary music therapy intervention, verbal therapy, or recreational music therapy condition. All interventions were scripted and manualized in a posttest only design. Concerning readiness to change, results indicated there were significant between-group differences in Contemplation and Action subscales, with participants in the rockumentary and recreational music therapy conditions having higher means than participants in the verbal therapy condition. There were no differences between the two music therapy conditions concerning readiness to change variables. Although not significant, participants in both music therapy conditions tended to have lower mean craving scores than participants in the verbal therapy condition. Concerning Likert-type ratings of motivation to change, perception of helpfulness, and perception of enjoyment, participants in both music therapy conditions tended to have slightly higher mean scores than participants in the verbal therapy conditions. Participants' posttest written comments were positive, regardless of condition. Limitations of the study, suggestions for the future inquiry, and implications for clinical practice are provided.