Greetings

Dear david, there are many studies performed in music therapy and you can use them and provide your new method and protocol by evaluating the validity and reliability  in order to imrove and treat the mental disorders. Surly it will be of interest for researchers.

I don't think there are any studies out there yet, but a feasibility/acceptability investigation would be the important first step. Good luck getting funding for that one :)

Dear david, like Morteza Taheri, I Think that there are many studies performed in music therapy and you can use them and provide your new method and protocol by evaluating the validity and reliability  in order to improve and treat the mental disorders. I don`t 

know specifically about Air Guitar, but It`s possible you can find about spanish guitar and another instruments. 

It may be of interest to you:

https://www.voices.no/index.php/voices

http://musictherapytoday.wfmt.info/Music_Therapy_Today/Home.html

Good luck!

Dear friend

not needed to focus just in air guitar....As I pointed, try to have your own protocol validate and work on it. surely, Its of interest to you and other researchers.

Best Regards