"Hi there,

I'm reaching out to inquire about obtaining exclusive piano sheet music for the song 'Luna' by 15. I'm a huge fan of the artist and I'm interested in performing a piano cover of the song.

Would you like me to add or modify something?

Also, if you're an artist looking to create content with the song, you may want to consider reaching out to the publisher or copyright holder directly, or using a reputable sheet music provider to obtain the necessary permissions and licenses.

Thank you so much for your time and I look forward to hearing back from you.

Best regards, [Your Name]"