I recommend Natsukiso's MML maker [1RW33KNE]. The Japanese text is almost ignorable.
After you finish composing, go to MENU and select "EXPORT MML", save it, then type these in your program and enjoy!
VAR STRMML$=LOAD("TXT:YOURFILENAME",FALSE)
BGMPLAY STRMML$
Replace YOURFILENAME with the actual file name you saved, of course.
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