Sounds or music into a DC fan?
You could try that, but if you get any sound out then it would be by accident.  It's equally likely that you'll damage something trying.  Standard DC muffin fans want a DC input, not an AC input.  They don't work well with anything AC.

There is a type of device called a rotary woofer, which is basically a fan that changes the pitch of the fan blades to move air.  The speed of the fan remains constant, but only the blade pitch is changed.  It's wacky, for sure.