Colors Change To Music? I know how to bake sound to F-Curves and stuff but how do I do that with colors? Like, can I have a material that becomes lighter when the music changes?
You can keyframe colour values the same as any other value, the catch is it will only keyframe the rgb values, not hsv.

To keyframe a colour either press I with the cursor over the colour or right-click  RMB and select Insert Keyframe.

While you can then bake a sound into any of the keyed colour channels, it will be an erratic change, not a smooth fade that you most likely want, so you will want to manually key the fade that you want at the right time.