This report synthesises findings from 8 peer-reviewed papers addressing the following research question: How does the cross-domain robustness of MusT-RAG compare to zero-shot re-ranking methods like RerankLM when evaluated on out-of-domain music QA benchmarks. 6 claims were extracted from source literature; 6 were independently verified against retrieved documents. An automated multi-reviewer quality assessment produced a score of 8.3/10. This report is a machine-generated literature synthesis and does not constitute original research.Research goal: How does the cross-domain robustness of MusT-RAG compare to zero-shot re-ranking methods like RerankLM when evaluated on out-of-domain music QA benchmarks?Autonomous literature synthesis. Automated review score: 8.3/10. Full text and citation available at Assignee Research.