Send a letter to your favorite musician asia wrote this letter to Kings Of Leon

hi. my best friend is your bigest fan she is going to go to your concert in poland even if is hasn't got any money but it doesn't matter, because she has her 18 birthday on 3 of february and my huge asking is : can you with your band record short greeting for Karolina's birthday and send it to my e-meil? i would be very greatful :)