In the beginning, most video games used FM synthesis for music. Recall that FM synth generates tones through mathematical formulas—you say you want a sine wave, modulated with another wave, with some mathematical effects or some noise added on for fun. This leads to a wide variety of sounds, but unfortunately, a wide variety of sounds that all sound like a synthesizer. Over the years many valiant attempts were made to represent mathematically the sounds of various instruments. For some instruments (like the flute) this worked well, but for most instruments, the results were less than spectacular, and for a few critical instruments (brass instruments and drums in particular), the results were abysmal.Tracked music is essentially FM synth on steroids. Instead of using mathematical formulas to represent instrument sounds, the sounds of the instruments themselves are digitized and stored in the song, and the CPU uses math to raise or lower the pitch of a sample to the appropriate note. Now, instruments sounded reasonably close to their real-life counterparts. The sound quality of any one instrument still wasn't perfect, but it was good enough, and when you combined several voices of these instruments you could actually come out with a pretty decent song.Tracked music does, on a more basic level, what DirectMusic does. The DirectMusic synthesizer allows you to use your own sample sets (called bands) for instruments, and provides more options for using samples (for example, you can have several samples of one instrument, each representing a note played at a different pitch or intensity).
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