Dear Nader,

A great question! The following resources may interest you:

http://www.musictherapy.org/research/factsheets/

http://www.bamt.org/british-association-for-music-therapy-resources/bamt-information-leaflets.html

http://www.austmta.org.au/publications

Dear  Stephen ,

What is your opinion about the question?

Dear Kostas,

My mean is its somatic effects.

Dear Nader,

I agree with your opening statement: "...Music therapy is an allied health profession and one of the expressive therapies, consisting of a process in which a music therapist uses music..."

I used to employ it as a beginning, or an adjunct, component of therapy with children and adolescents with mental disorders; however, the more I read about how it can be applied to different populations with diverse problems in diversified settings, the more open I am to use it with various populations including certain chronic diseases to enhance treatment. For music can reach a person when words can't.

Dear Aghakhani,

You can read this website for the Music therapy. There is very great material that can help you.Τhe articles are from abroad. Also, the language of articles is English. This site helps many undergraduate, postgraduate and PhD students who doing  research for music therapy. 

http://mousikitherapeuei.blogspot.gr/ 

Sincerely, 

Kostas Mantzikos

 Dear Stephen ,

I hope you understand that I notice to physiological aspects not mental aspects of diseases.

Dear Nader, 

the human being has 3 dimensions: body, mind and soul. All 3 are impacted by music. 

Thesis The Effects of Music on Pain: A Review of Systematic Reviews...

Article The pleasures of sad music: a systematic review

Can you explain about its body(physiological dimension that is affected by music?

Here you are: 

Article The influence of relaxation music on physiological responses...

Article The effects of music on physiological responses and sedation...

There are a couple of things I think may be helpful for you. 1) Is the Music and Memory program- See https://musicandmemory.org/

And = a recent article published - Where they did imaging while patients listened to music- Fascinating. I believe this article is available through Medscape. 

Music, Memory and Mechanisms in Alzheimer's Disease

Camilla N. Clark and Jason D. Warren

Brain. 2015;138(8):2122-2125. 

http://www.whydontyoutrythis.com/2013/10/according-to-scientists-this-is-the-most-relaxing-tune-ever-recorded.html

I came across this brief article with references:

Music--The Medicine of the Mind by Jennifer Gibson, Pharm.D.:

"Music is the language of the soul. Where words end, music begins. Now, a review article suggests that where modern medicine ends, music begins.

The review evaluated 30 trials that included almost 2,000 cancer patients who received music therapy in concert with traditional treatment. Overall, music had a beneficial effect on the patients’ anxiety levels and moods. Music also decreased the patients’ heart rates, respiratory rates, and blood pressures. Patients reported an increased quality of life after intervention with music therapy..."

http://brainblogger.com/2011/09/11/music-the-medicine-of-the-mind/

Regarding the modern concept of men used in Medicine with body- social etc. environment -mind -soul -spirituality so this shows that everything is influencing everything, if we know it or not, if there is research with evidence or not. So lets put the right questions because only then you get the interesting answers.

Congratulations for your subject of research!