Dear Sir or Madam,
This is Eren writing from Turkey. I am aware that you are not looking for a non-native speaker; yet, I would appreciate it if you could just give me a chance to prove my English to you. I have been educated in English for my whole life and I shall count myself as a half-native speaker.
Also, I am working as a music teacher now. I am a sociology graduate, and made my masters degree on music theory. Therefore, I have lots of subjects to discuss, or point out on my writings; politics, music, classical music, popular music, the effects of music on socieities, and so on.
If you have such subjects to write about, I believe I am a very strong candidate for your job.
Best regards,
Zeynep Eren Kovankaya