As with most of the other things you've learned, if you don't want to use DirectMusic to Play MIDI files, you can use the Windows MCI to Play them. Note that the Windows MCI doesn't give you precise control over MIDI files—for example, you can't synchronize them to other things and you can't Play certain MIDI files. See the Windows Platform SDK documentation, at Platform SDK\Graphics and Multimedia Services\Multimedia Audio\Musical Instrument Digital Interface (MIDI)\About MIDI\Media Control Interface (MCI).You can also Play MIDI files a third way: by using the low-level MIDI input and output routines. These API routines are what most sequencer programs use to record, Playback, and manipulate MIDI data on a very low level. Here, there's nothing you would want to do that you can't, but most things are fairly difficult to implement and there's a lot of code that must be written. Most games don't need to bother with the low-level MIDI interface—your best bet is to use DirectMusic if you want advanced control and MIDI synchronization capabilities, or MCI if you just want simple MIDI Playback without the constraints of DirectX.
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