Silverman 2017.

Study characteristics
Methods	Study design: cluster RCT Study grouping: parallel group Allocation concealment: no information on allocation concealment Randomisation method: throughout 24 MT treatment sessions, the researcher cluster‐randomised consumers into conditions by session. A computer program was used for randomisation. The numbers 1–24 were randomised into 3 groups and each group was assigned to MT (songwriting), recreational music, or wait‐list control.
Participants	Baseline characteristics MT + SC Gender male: 19 (61.3%) Age: 40.81 (13.51) years Sample size: 31 Recreational music + SC Gender male: 31 (59.6%) Age: 38.17 (12.80) years Sample size: 52 SC (wait‐list control) Gender male: 30 (58.8%) Age: 34.67 (12.08) years Sample size: 51 Overall Gender male: 80 (59.7%) Age: 37.88 (12.79) years Sample size: 134 Inclusion criteria: inpatient status on detoxification unit; ability to read English Exclusion criteria: none stated Pretreatment: significant between‐group differences in number of patients taking part in each session who volunteered to be research participants and the total number of participants in each session (with MT having lower means than the recreational music and wait‐list control conditions). No statistically significant between‐group differences in participants' ages; number of times participants had been in a rehabilitation/detoxification facility; or demographic variables of gender, race/ethnicity, or primary drug.
Interventions	Intervention characteristics MT + SC Description: MT using educational songwriting with lyrics about recovery, including motivators and strategies to promote change and sobriety. Implemented by a music therapist. Session length: approximately 45 minutes Frequency: single session Duration of treatment: single session Recreational music + SC Description: rock and roll bingo game with discussion based on songs, artists, and memories associated with the music. Implemented by a music therapist. Session length: approximately 45 minutes Frequency: single session Duration of treatment: single session SC (wait‐list control) Description: this condition was identical to the recreational MT condition, with the exception that participants completed the questionnaire before the intervention instead of after it. Session length: not applicable Frequency: not applicable Duration of treatment: not applicable
Outcomes	Substance craving – Alcohol Craving Questionnaire – Short Form – Revised (ACQ‐SF‐R) Outcome type: continuous outcome Reporting: partially reported Direction: lower is better Data value: endpoint Notes: 12 items using 7‐point Likert scale responses
Identification	Sponsorship source: none Country: USA Setting: inpatient detoxification unit Author's name: Michael J Silverman Institution: University of Minnesota Email: silvermj@umn.edu Address: University of Minnesota, Minneapolis, Minnesota, USA Declarations of interest: no conflicts of interest reported.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Judgement comment: use of computerised random‐number generator.
Allocation concealment (selection bias)	Unclear risk	Judgement comment: insufficient information about allocation concealment to permit judgement.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Judgement comment: missing outcome data balanced in numbers across intervention groups, with similar reasons for missing data across groups.
Selective reporting (reporting bias)	Low risk	Judgement comment: no selective outcome reporting.
Blinding of participants and providers (performance bias) (subjective outcomes)	Low risk	Judgement comment: not possible to blind participants and providers to MT intervention.
Blinding of outcome assessor (detection bias) (subjective outcomes)	Unclear risk	Judgement comment: not possible to blind outcome assessor for self‐report outcomes, though measurement not likely to be influenced differentially between groups.