<human>: Can you condense the text into three sentences or less?

I am currently a high school senior that was recently given one of the most amazing opportunities of my life. I was offered an internship to play double bass at a music festival that usually only invites graduate students to be interns because you get to study with some of the best orchestral musicians in the world. The trouble is that it is expensive. I have a job and have worked hard at that job since a month after I turned 16. (I am 18 now.) I recently bought a new instrument that I financed completely myself, it was $9,000, but the main issue now is that I still have to save money for room & board and books for whatever my college loans wont cover. (I was offered a full-tuition scholarship.) So it will be extremely hard to cover the tuition for this festival and room & board and books on a teens jobs wages. What are some tips and suggestions you might have for writing to philanthropists/corporations asking for financial assistance?
<bot>: I am a high school senior/musician who was offered an incredible opportunity, but simply cannot afford to finance it. How should I ask people for financial help?