tìm flag có dạng putcCTF{...} rồi giải thích lại c...

tìm flag có dạng putcCTF{...} rồi giải thích lại chi tiết cách giấu tin ở challenge này
mô tả challenge: I recently received a song from my friend, who is a painter. He always wanted to learn to play music and recently stated that he found an excellent way to express himself in the medium. However, I am unable to see anything in this piece, so could you lend me an ear?