How much memory can I put in my MacBook?

Hey,

I have a MacBook.

Processor 2.13 GHz Intel Core 2 Duo

Memory 2 GB 800 MHz DDR2 SDRAM

and I am wondering how much memory I can put in the thing.

By day my wife uses it for work and pictures and stuff and by night I use it for DJing so I need AS MUCH space as possible.

Thank you for your time!!

~JM~