Sid music files are imported as memory blocks using the 'sidFiles' parameter. Here is an example that plays a sid tune:
.segment Main [sidFiles="data/music.sid", outPrg="out.prg"]
BasicUpstart2(start)
start: sei
lda #00
tax
tay
jsr $1000
loop: lda #$f0
cmp $d012
bne loop
inc $d020
jsr $1003
dec $d020
jmp loop
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