10 SOUND 255,1The first value is pitch and the second is duration. This is most useful for notifications and small sound effects. Play Command
10 PLAY "ABCDEFG"The play command acts more like a regular instrument with the standard notes. You can even change octave:
10 PLAY "O1ABCDEFG" 20 PLAY "O4ABCDEFG"You can also change the tempo.
10 PLAY "T255ABCDEFGABCDEFG"Advanced Sound
For more sophisticated music, DAMS and Composer were software packages that gave the effect of four different notes being played at the same time.