Here's a response letter to Mark, following the guidelines provided:
From: Russian_friend@mail.ru
To: Mark@mail.uk
Subject: Music
Dear Mark,
Thank you for your email! I appreciate your thoughts about the classical music concert. Personally, I prefer pop music because it’s so lively and uplifting. I would love to attend a concert by Ed Sheeran; his music really resonates with me. As for playing musical instruments, I can play the guitar. It's a lot of fun, and I enjoy strumming my favorite songs.
Looking forward to hearing from you soon!
Best wishes,
[Your Name]
Feel free to replace "[Your Name]" with your actual name or signature. This letter is concise, addresses all of Mark's questions, and maintains a friendly tone.