Hello. I can help you. My name is Antonio, and I am a Spanish citizen, bilingual in English, which was my mother´s native tongue. I grew up speaking both languages. The only problem that I can see is that I don´t have a technical music vocabulary.
If you are interested, please contact me through Freelancer. You could give me a list of the technical words that you will use, and I would look for the spanish terms.
Regards.