C5 30 = lds si,[bx+si] (initially bx=0 and si=100h, therefore ds becomes AD04 which is close enough to screen memory)
04 AD = add al,ADh
E6 61 = out 61h,al (this is the music player)
EB F9 = jmp 101h
After the jmp, the following is executed:
30 04 = xor [si],al
AD = lodsw
