To load and play an MML song you can simply specify the MML string in the BGMPLAY command like this...
BGMPLAY "CDEFGAB<C"
Another way to play MML is by using BGMSET to assign a tune number to an MML string, then specifying the track number in BGMPLAY, like this...
BGMSET 128,"CDEFGAB<C"
BGMPLAY 128
Yet another way involves using labels and the DATA command, although it's more advanced.
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