I have a keyboard that I would like to connect to my computer somehow and record what I'm playing. (I have a sound input jack in my computer) Is this possible?
You have a couple options: if your keyboard has midiports, you can easily add midiports to your computer via an adapter that will connect to your soundcard's joystick connector.
If you don't have midiports, use the keyboards "line-out" or "headphone" jack to plug into your soundcards "line-in" or "mic in"