Dear Mark,
Thank you for your letter! I love rock music the most — it's very energetic and fills me with positivity. I would really like to attend a concert of my favorite singer because it would be unforgettable! I can play a little guitar, although not very well yet. What about you? What kind of music do you like, and which concert would you like to go to? I hope we will talk again soon!
Warm regards, [your name]