Son's speech therapist refuses to recommend music therapy for Andy

The county that we live in has agreed to pay for music therapy for my son, but first his school speech therapist must write a letter stating that it would be beneficial for Andy. I asked nicely, and she refused. It was a bit disappointing. This is how the email went:

Dear Speech therapist,

The county has told me that they would pay for music therapy for Andy, if you feel that he would benefit from music therapy. We would need a letter from you stating that he would benefit and that he has a deficit in one or more of the three areas of receptive, expressive or pragmatic language skills. Please let me know your thoughts. 

Thank you!

She prepared a letter that did NOT recommend speech therapy for Andy, however, it stated his deficits and that "Andy responds well to music". She clearly was not stating that Andy would benefit from music therapy in any way. I submitted the letter anyway. When it was rejected by the county, I sent this:

Hello Speech therapist,

The county would like to know if you feel music therapy would benefit Andy. They told me the letter was rejected because it doesn't state how music therapy would benefit Andy. Could you elaborate on this in your letter so we can try one more time? 

Thanks,

Amy

I got this:

I clarified this with the special ed director and was told that the school district is unable to directly recommend outside therapies, since it can make them liable to pay for them.  I have CC'd the special ed director on this email in case there is anything else I can do from my position.  I am so sorry- I tried to state in my letter that Andy loves music.  

The special ed director further said:

Good morning,

It is difficult for school staff to recommend outside therapy if they do not see a need for it within the school environment.  Staff can write a letter based on observations they see within the classroom and/or therapy time. It sounds like the speech therapist wrote the appropriate letter based on her observation within her therapy sessions.  If you have any other questions please let me know.

I really still do not know whether it is the therapists' professional opinion that music therapy would benefit Andy or not, because she refuses to answer!Basically so they won't be held liable for payment. Really??  How frustrating!

Here are some parts of the letter: 

Andy presents with a significant expressive, receptive and pragmatic language disorder. His current eligibility for services is SXI...Andy responds well to music...

None of which, helped him to get the music therapy being offered to him by the county. Again, the school continues to create roadblocks for my son. Sigh