How to enable sound card in DOS mode?

I would like to know how to enable sound card/sound blaster music when booting up in DOS mode instead of Windows. What autoexec.bat or config.sys settings do I have to add to do this? (I think there used to be some sort of “set blaster=…” setting, but I cannot recall what the specific command is.) If someone could please walk me through how to enable the sound card in DOS mode it would be appreciated.