I have analysed the arkos music data structure. I did two builds of the data and compared the differences.
From that information I made the code I have attached.
use akstobin to locate it at *0*.
The source shows how to use it.
I haven't made a sdcc compatible version yet. It could make it easier for data management.
incbin the data (without header), and use the code to "fix" it in place.
Then use the player functions :)