【正确答案】
Dear Linda,
I'm writing to show my gratitude to you for your terrific gift-a CD, in which all pieces of music was played by Chopin.
Since I was a little child, I have taken a fancy to music. It can always give me great pleasure. When I am not in a good mood, I just listen to some wonderful music so as to calm myself down. Among all the musicians, Chopin is my favorite one. Therefore, it's so kind of you to pick his collection as my birthday present.
Many thanks again! Best regards to you and your family.