Calm relaxation music helps reduce stress, anxiety, pain and insomnia. Many studies demonstrate music can also help reduce stress associated with surgery, operations and dental procedures. Music therapy can even help deal with mental health problems such as schizophrenia.
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Jespersen KV, Koenig J, Jennum P, Vuust P. Music for insomnia in adults. Cochrane Database Syst Rev 2015; 8: CD010459. doi: 10.1002/14651858.CD010459.pub2. https://www.ncbi.nlm.nih.gov/pubmed/?term=Music+for+insomnia+in+adults.+Cochrane+Database+Syst+Rev+2015
van der Heijden MJ, Oliai Araghi S, van Dijk M, Jeekel J, Hunink MG. The Effects of Perioperative Music Interventions in Pediatric Surgery: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. PLoS One. 2015 Aug 6;10(8):e0133608. doi: 10.1371/journal.pone.0133608. eCollection 2015. http://www.ncbi.nlm.nih.gov/pubmed/26247769
Bradt J, Dileo C, Shim M. Music interventions for preoperative anxiety. Cochrane Database of Systematic Reviews 2013, Issue 6. Art. No.: CD006908. DOI: 10.1002/14651858.CD006908.pub2 http://www.cochrane.org/CD006908/ANAESTH_can-music-interventions-replace-sedatives-for-reduction-of-preoperative-anxiety
Bradt J, Dileo C, Potvin N. Music for stress and anxiety reduction in coronary heart disease patients. Cochrane Database of Systematic Reviews 2013, Issue 12. Art. No.: CD006577. DOI: 10.1002/14651858.CD006577.pub3 http://www.cochrane.org/CD006577/VASC_music-to-reduce-stress-and-anxiety-for-people-with-coronary-heart-disease
Geretsegger M, Mössler KA, Bieleninik Ł, Chen XJ, Heldal TO, Gold C. Music therapy for people with schizophrenia and schizophrenia-like disorders. Cochrane Database of Systematic Reviews 2017, Issue 5. Art. No.: CD004025. DOI: 10.1002/14651858.CD004025.pub4. http://onlinelibrary.wiley.com/doi/10.1002/14651858.CD004025.pub4/full