It involved me sticking a 8GB microSD card into my normally 4GB MP3 player. Move all my w/vocal music (which is mostly anime/japanese stuff anyway) from the main player to the card, since that collection of music expands more rapidly than my instrumental/nonvocal collection does.
So now I have the entire 4GB of the main player for instrumental/nonvocal stuff, something I've been wanting for freakin ever.