Regarding the question "Please be as detailed as possible in the BGM score of Sword Spirit Banyue Lake Big Whale Dam", I'm sorry that I can only provide some simple help: 1. You can search for the piano score of this song online or Guitar tabs, these resources are relatively plentiful and easier to find. 2. If you want to try to write simplified musical notation yourself, you can use simplified musical notation software or online tools, such as "Kuwo Music Notation", "Literary and Fresh Simple Notation", etc. 3. For a detailed analysis and background introduction of BGM, you can look for game-related information or forum discussions to gain a deeper understanding of the origin and significance of this song. I hope the above suggestions will be helpful to you.